Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Reconciliation of Company's Financial Liabilities Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3) (Detail)

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Fair Value Measurements - Reconciliation of Company's Financial Liabilities Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3) (Detail) - Warrant Liabilities [Member] - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Balance at beginning of period $ 18,552 $ 44,350 $ 29,404 $ 6,069
Issuance of 2020 Warrants       31,392
Decrease in fair value [1] (6,358) (10,689) (17,210) (3,800)
Balance at end of period $ 12,194 $ 33,661 $ 12,194 $ 33,661
[1] The change in fair values of the warrant liabilities is recorded in other income (expense) in the consolidated statement of operations.