General form of registration statement for all companies including face-amount certificate companies

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Restatement of Previously Issued Financial Statements (Details)

v3.21.2
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Restatement of Previously Issued Financial Statements (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Error Corrections and Prior Period Adjustments Restatement [Line Items]          
Change in fair value of warrant liabilities $ (56,576,000)   $ 56,417,000    
Loss before income taxes (87,028,000) $ (21,804,000) (34,955,000) $ (103,596,000)  
Net loss (59,108,000) (21,804,000) (34,015,000) (103,596,000)  
Total comprehensive loss, net of taxes of $0 $ (59,120,000) $ (21,963,000) $ (34,099,000) $ (103,425,000)  
Earnings (loss) per share:          
Net loss per share-basic and diluted $ (0.25) $ (0.14) $ (0.22) $ (0.69)  
Tax on Comprehensive income (loss) $ 0 $ 0 $ 0 $ 0  
CONDENSED CONSOLIDATED BALANCE SHEETS          
Warrant liability 0 58,761 93,328,000    
Total current liabilities 39,406,000   30,499,000 20,642,000  
Total liabilities 48,023,000   125,984,000 33,640,000  
Additional paid-in capital 1,326,945,000   844,188,000 453,242,000  
Accumulated deficit (387,385,000)   (328,277,000) (294,262,000)  
Total Stockholders' Equity 939,564,000 138,625,000 515,925,000 (277,462,000) $ (184,569,000)
Cash flows from operating activities:          
Net loss $ (59,108,000) $ (21,804,000) (34,015,000) (103,596,000)  
As Reported          
Error Corrections and Prior Period Adjustments Restatement [Line Items]          
Loss before income taxes     (91,372,000)    
Net loss     (90,432,000)    
Total comprehensive loss, net of taxes of $0     $ (90,516,000)    
Earnings (loss) per share:          
Net loss per share-basic and diluted     $ (0.57)    
CONDENSED CONSOLIDATED BALANCE SHEETS          
Total liabilities     $ 32,656,000    
Additional paid-in capital     993,933,000    
Accumulated deficit     (384,694,000)    
Total Stockholders' Equity     609,253,000 $ 159,071,000  
Restatement Impact          
Error Corrections and Prior Period Adjustments Restatement [Line Items]          
Change in fair value of warrant liabilities     56,417,000    
Loss before income taxes     56,417,000    
Net loss     56,417,000    
Total comprehensive loss, net of taxes of $0     $ 56,417,000    
Earnings (loss) per share:          
Net loss per share-basic and diluted     $ 0.35    
CONDENSED CONSOLIDATED BALANCE SHEETS          
Warrant liability     $ 93,328,000    
Total liabilities     93,328,000    
Additional paid-in capital     (149,745,000)    
Accumulated deficit     56,417,000    
Total Stockholders' Equity     (93,328,000)    
Cash flows from operating activities:          
Net loss     $ 56,400,000