Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Summary of Reconciliation of Beginning and Ending Balances for Liabilities Measured at Fair Value on Recurring Basis (Detail)

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Fair Value Measurements - Summary of Reconciliation of Beginning and Ending Balances for Liabilities Measured at Fair Value on Recurring Basis (Detail)
$ in Thousands
9 Months Ended
Sep. 30, 2021
USD ($)
Warrant liabilities  
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]  
Beginning balance $ 51,156
Loan Agreement warrants 362
Gain (loss) adjustment to fair value (35,378)
Settlement for December 2020 Public Offering - Series 1 warrant exercise (805)
Ending balance 15,335
Derivative liabilities  
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]  
Beginning balance 5,954
Adjustment for conversion of April 2020 Notes (3,426)
Gain (loss) adjustment to fair value (1,772)
Ending balance $ 756