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Fair Value Hierarchy for Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Assets      
Total assets $ 224,993   $ 157,091
Money Market Funds      
Assets      
Total assets 71,374   23,128
U.S. Treasuries      
Assets      
Total assets 28,465   32,579
U.S. Government Agency Securities      
Assets      
Total assets 47,472   40,321
Corporate Debt Securities      
Assets      
Total assets 77,682   61,063
Warrant Liability      
Liabilities      
Total liabilities 31,737 $ 10,736  
Fair Value, Inputs, Level 1      
Assets      
Total assets 71,374   23,128
Fair Value, Inputs, Level 1 | Money Market Funds      
Assets      
Total assets 71,374   23,128
Fair Value, Inputs, Level 2      
Assets      
Total assets 153,619   133,963
Fair Value, Inputs, Level 2 | U.S. Treasuries      
Assets      
Total assets 28,465   32,579
Fair Value, Inputs, Level 2 | U.S. Government Agency Securities      
Assets      
Total assets 47,472   40,321
Fair Value, Inputs, Level 2 | Corporate Debt Securities      
Assets      
Total assets 77,682   $ 61,063
Fair Value, Inputs, Level 3 | Warrant Liability      
Liabilities      
Total liabilities $ 31,737 $ 10,736