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Fair Value Measurement - Summary of Opening Balances of Assets and Liabilities Categorized Within Level 3 of the Fair Value Hierarchy Measured at Fair Value on a Recurring Basis (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
Fair Value Disclosures [Abstract]  
Debt securities classified as available-for-sale, Beginning Balance $ 4,320
Debt securities classified as available-for-sale, Interest expenses, net 804
Debt securities classified as available-for-sale, Change in fair value (2,624)
Debt securities classified as available-for-sale, Ending Balance 2,500
Warrant liability, Additions (69,414)
Warrant liability, Exercise 49,053
Warrant liability, Change in fair value (100,286)
Warrant liability, Ending Balance $ (120,647)