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 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Balance at beginning of period $ 23,838 $ 5,654 $ 29,404 $ 6,070
Issuance of 2020 Warrants   31,391   31,391
(Decrease) increase in fair value [1] (5,286) 7,305 (10,852) 6,889
Balance at end of period $ 18,552 $ 44,350 $ 18,552 $ 44,350
[1] The change in fair values of the warrant liabilities is recorded in other income (expense) in the consolidated statement of operations.