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Fair Value Measurements - Summary of Changes in Fair Values Level Financial Liabilities Recurring Basis Using Unobservable Inputs (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 31, 2020
Sep. 30, 2020
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Reclassification of warrant liabilities to equity $ 62,175 $ 62,175
Changes in fair value of warrant liabilities   16,240
Fair Value Measurements Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Beginning Balance 56,420 56,420
Changes in fair value   17,725
Settlement of financial liabilities by securities issuance   (11,970)
Reclassification of warrant liabilities to equity   (62,175)
Fair Value Measurements Recurring [Member] | Series A Warrant [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Beginning Balance 32,616 32,616
Changes in fair value of warrant liabilities   11,597
Reclassification to equity   (44,213)
Fair Value Measurements Recurring [Member] | Series B Warrant [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Beginning Balance 13,319 13,319
Changes in fair value of warrant liabilities   4,643
Reclassification to equity   (17,962)
Fair Value Measurements Recurring [Member] | Warrant Issuance Obligation [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Beginning Balance 3,036 3,036
Settlement of financial liabilities by securities issuance   (3,188)
Changes in fair value   152
Fair Value Measurements Recurring [Member] | Common stock Issuance Obligation [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Beginning Balance $ 7,449 7,449
Settlement of financial liabilities by securities issuance   (8,782)
Changes in fair value   $ 1,333