1001 - Document - Cover Page link:presentationLink link:definitionLink link:calculationLink 1002 - Statement - Unaudited Condensed Consolidated Balance Sheets link:presentationLink link:definitionLink link:calculationLink 1003 - Statement - Unaudited Condensed Consolidated Balance Sheets (Parenthetical) link:presentationLink link:definitionLink link:calculationLink 1004 - Statement - Unaudited Condensed Consolidated Statements of Operations link:presentationLink link:definitionLink link:calculationLink 1005 - Statement - Unaudited Condensed Consolidated Statements of Comprehensive Loss link:presentationLink link:definitionLink link:calculationLink 1006 - Statement - Unaudited Condensed Consolidated Statements of Cash Flows link:presentationLink link:definitionLink link:calculationLink 1007 - Statement - Unaudited Condensed Consolidated Statements of Stockholders' Equity (Deficit) link:presentationLink link:definitionLink link:calculationLink 1008 - Disclosure - Basis of Presentation link:presentationLink link:definitionLink link:calculationLink 1009 - Disclosure - Impact of COVID-19 Pandemic link:presentationLink link:definitionLink link:calculationLink 1010 - Disclosure - Recent Accounting Pronouncements link:presentationLink link:definitionLink link:calculationLink 1011 - Disclosure - Revenue Recognition link:presentationLink link:definitionLink link:calculationLink 1012 - Disclosure - Net Loss Per Share link:presentationLink link:definitionLink link:calculationLink 1013 - Disclosure - Inventories link:presentationLink link:definitionLink link:calculationLink 1014 - Disclosure - Composition of Certain Balance Sheet Accounts link:presentationLink link:definitionLink link:calculationLink 1015 - Disclosure - Intangible Assets link:presentationLink link:definitionLink link:calculationLink 1016 - Disclosure - Composition of Certain Reserves and Allowances link:presentationLink link:definitionLink link:calculationLink 1017 - Disclosure - Long-Term Debt and Other Liabilities link:presentationLink link:definitionLink link:calculationLink 1018 - Disclosure - Interest Costs link:presentationLink link:definitionLink link:calculationLink 1019 - Disclosure - Leases link:presentationLink link:definitionLink link:calculationLink 1020 - Disclosure - Commitments and Contingencies link:presentationLink link:definitionLink link:calculationLink 1021 - Disclosure - Fair Value of Financial Assets and Liabilities link:presentationLink link:definitionLink link:calculationLink 1022 - Disclosure - Income Tax link:presentationLink link:definitionLink link:calculationLink 1023 - Disclosure - Business Segments and Major Customers link:presentationLink link:definitionLink link:calculationLink 1024 - Disclosure - Employee Retirement and Postretirement Benefits link:presentationLink link:definitionLink link:calculationLink 1025 - Disclosure - Research and Development Costs link:presentationLink link:definitionLink link:calculationLink 1026 - Disclosure - Basis of Presentation (Policies) link:presentationLink link:definitionLink link:calculationLink 1027 - Disclosure - Recent Accounting Pronouncements (Tables) link:presentationLink link:definitionLink link:calculationLink 1028 - Disclosure - Revenue Recognition (Tables) link:presentationLink link:definitionLink link:calculationLink 1029 - Disclosure - Net Loss Per Share (Tables) link:presentationLink link:definitionLink link:calculationLink 1030 - Disclosure - Inventories (Tables) link:presentationLink link:definitionLink link:calculationLink 1031 - Disclosure - Composition of Certain Balance Sheet Accounts (Tables) link:presentationLink link:definitionLink link:calculationLink 1032 - Disclosure - Intangible Assets (Tables) link:presentationLink link:definitionLink link:calculationLink 1033 - Disclosure - Composition of Certain Reserves and Allowances (Tables) link:presentationLink link:definitionLink link:calculationLink 1034 - Disclosure - Long-Term Debt and Other Liabilities (Tables) link:presentationLink link:definitionLink link:calculationLink 1035 - Disclosure - Interest Costs (Tables) link:presentationLink link:definitionLink link:calculationLink 1036 - Disclosure - Leases (Tables) link:presentationLink link:definitionLink link:calculationLink 1037 - Disclosure - Fair Value of Financial Assets and Liabilities (Tables) link:presentationLink link:definitionLink link:calculationLink 1038 - Disclosure - Business Segments and Major Customers (Tables) link:presentationLink link:definitionLink link:calculationLink 1039 - Disclosure - Employee Retirement and Postretirement Benefits (Tables) link:presentationLink link:definitionLink link:calculationLink 1040 - Disclosure - Basis of Presentation - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 1041 - Disclosure - Impact of COVID-19 Pandemic - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 1042 - Disclosure - Recent Accounting Pronouncements - Summary of Adoption Impact of ASC 326 on Unaudited Condensed Consolidated Balance Sheet (Detail) link:presentationLink link:definitionLink link:calculationLink 1043 - Disclosure - Revenue Recognition - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 1044 - Disclosure - Revenue Recognition - Summary of Revenue Disaggregated by Category (Detail) link:presentationLink link:definitionLink link:calculationLink 1045 - Disclosure - Net Loss Per Share - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 1046 - Disclosure - Net Loss Per Share - Computation of Basic and Diluted Earnings Per Share (Detail) link:presentationLink link:definitionLink link:calculationLink 1047 - Disclosure - Inventories - Components of Inventories (Detail) link:presentationLink link:definitionLink link:calculationLink 1048 - Disclosure - Composition of Certain Balance Sheet Accounts - Schedule of Prepaid Expenses and Other Current Assets (Detail) link:presentationLink link:definitionLink link:calculationLink 1049 - Disclosure - Composition of Certain Balance Sheet Accounts - Schedule of Prepaid Expenses and Other Current Assets (Detail) (Parenthetical) link:presentationLink link:definitionLink link:calculationLink 1050 - Disclosure - Composition of Certain Balance Sheet Accounts - Property and Equipment (Detail) link:presentationLink link:definitionLink link:calculationLink 1051 - Disclosure - Composition of Certain Balance Sheet Accounts - Schedule of Other Non-Current Assets (Detail) link:presentationLink link:definitionLink link:calculationLink 1052 - Disclosure - Composition of Certain Balance Sheet Accounts - Schedule of Other Non-Current Assets (Detail) (Parenthetical) link:presentationLink link:definitionLink link:calculationLink 1053 - Disclosure - Composition of Certain Balance Sheet Accounts - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 1054 - Disclosure - Composition of Certain Balance Sheet Accounts - Accrued Liabilities (Detail) link:presentationLink link:definitionLink link:calculationLink 1055 - Disclosure - Composition of Certain Balance Sheet Accounts - Other Non-Current Liabilities (Detail) link:presentationLink link:definitionLink link:calculationLink 1056 - Disclosure - Intangible Assets - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 1057 - Disclosure - Intangible Assets - Schedule of Intangible Assets, Other than Goodwill (Detail) link:presentationLink link:definitionLink link:calculationLink 1058 - Disclosure - Intangible Assets - Summary of Amortization Expenses (Detail) link:presentationLink link:definitionLink link:calculationLink 1059 - Disclosure - Composition of Certain Reserves and Allowances (Detail) link:presentationLink link:definitionLink link:calculationLink 1060 - Disclosure - Composition of Certain Reserves and Allowances - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 1061 - Disclosure - Long-Term Debt and Other Liabilities - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 1062 - Disclosure - Long-Term Debt and Other Liabilities - Schedule of Long-Term Debt (Detail) link:presentationLink link:definitionLink link:calculationLink 1063 - Disclosure - Long-Term Debt and Other Liabilities - Summary of Redemption Prices Plus Accrued and Unpaid Interest (Detail) link:presentationLink link:definitionLink link:calculationLink 1064 - Disclosure - Interest Costs - Summary of Interest Costs (Detail) link:presentationLink link:definitionLink link:calculationLink 1065 - Disclosure - Leases - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 1066 - Disclosure - Leases - summary of our lease expense (Detail) link:presentationLink link:definitionLink link:calculationLink 1067 - Disclosure - Leases - Other information regarding our leases (Detail) link:presentationLink link:definitionLink link:calculationLink 1068 - Disclosure - Leases - Annual Future Minimum Obligations for Operating Leases Other than Arrangements with Commercial Airline Partners (Detail) link:presentationLink link:definitionLink link:calculationLink 1069 - Disclosure - Commitments and Contingencies - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 1070 - Disclosure - Fair Value of Financial Assets and Liabilities - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 1071 - Disclosure - Fair Value of Financial Assets and Liabilities - Summary of Fair Value and Carrying Value of Long-Term Debt (Detail) link:presentationLink link:definitionLink link:calculationLink 1072 - Disclosure - Fair Value of Financial Assets and Liabilities - Summary of Fair Value and Carrying Value of Long-Term Debt (Parenthetical) (Detail) link:presentationLink link:definitionLink link:calculationLink 1073 - Disclosure - Income Tax - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 1074 - Disclosure - Business Segments and Major Customers - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 1075 - Disclosure - Business Segments and Major Customers - Summary of Reportable Segments (Detail) link:presentationLink link:definitionLink link:calculationLink 1076 - Disclosure - Business Segments and Major Customers - Reconciliation of Segment Profit (loss) (Detail) link:presentationLink link:definitionLink link:calculationLink 1077 - Disclosure - Business Segments and Major Customers - Reconciliation of Segment Profit (loss) (Parenthetical) (Detail) link:presentationLink link:definitionLink link:calculationLink 1078 - Disclosure - Employee Retirement and Postretirement Benefits - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 1079 - Disclosure - Employee Retirement and Postretirement Benefits - Summary of Stock-Based Compensation Expense by Operating Expense (Detail) link:presentationLink link:definitionLink link:calculationLink 1080 - Disclosure - Research and Development Costs - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink