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Fair Value Measurements - Summary of Changes in Fair Values Level Financial Liabilities Recurring Basis Using Unobservable Inputs (Detail)
$ in Thousands
3 Months Ended
Mar. 31, 2020
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Changes in fair value $ 16,240
Reclassification to equity 62,175
Fair Value Measurements Recurring [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Beginning Balance 56,420
Changes in fair value 17,725
Settlement of financial liabilities by securities issuance (11,970)
Reclassification to equity (62,175)
Ending Balance 0
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
Changes in fair value 11,597
Reclassification to equity (44,213)
Ending Balance 0
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
Changes in fair value 4,643
Reclassification to equity (17,962)
Ending Balance 0
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
Changes in fair value 152
Settlement of financial liabilities by securities issuance (3,188)
Ending Balance 0
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
Changes in fair value 1,333
Settlement of financial liabilities by securities issuance (8,782)
Ending Balance $ 0