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Unaudited Condensed Statements of Redeemable Convertible Preferred Stock and Stockholders' Equity - USD ($)
$ in Thousands
Total
Series H redeemable convertible preferred stock
Common Stock
Additional Paid-in Capital
Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2017 497,691,757        
Beginning balance at Dec. 31, 2017 $ 92,046        
Increase (Decrease) in Temporary Equity [Roll Forward]          
Accretion of redeemable convertible preferred stock $ 9,318        
Issuance of Series redeemable convertible preferred stock for aggregate proceeds, net of issuance costs (in shares) 34,914,327        
Issuance of Series redeemable convertible preferred stock for aggregate proceeds, net of issuance costs $ 3,868        
Deemed dividend recognized on beneficial conversion features of Series H redeemable convertible preferred stock (Note 8)   $ 0      
Ending balance (in shares) at Dec. 31, 2018 532,606,084        
Ending balance at Dec. 31, 2018 $ 105,232        
Beginning balance (in shares) at Dec. 31, 2017     63,005    
Beginning balance at Dec. 31, 2017 (96,684)   $ 0 $ 50,954 $ (147,638)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Accretion of redeemable convertible preferred stock (9,318)     (9,318)  
Stock-based compensation 114     114  
Issuance of Series redeemable convertible preferred stock for aggregate proceeds of $____ per share, net of issuance costs of $___ (Note 8) (1,152)     (1,152)  
Net loss $ (8,012)       (8,012)
Ending balance (in shares) at Dec. 31, 2018 63,005   63,005    
Ending balance at Dec. 31, 2018 $ (111,966)   $ 0 40,598 (152,564)
Increase (Decrease) in Temporary Equity [Roll Forward]          
Accretion of redeemable convertible preferred stock $ 4,640        
Issuance of Series redeemable convertible preferred stock for aggregate proceeds, net of issuance costs (in shares) 148,928,337 233,446,519      
Issuance of Series redeemable convertible preferred stock for aggregate proceeds, net of issuance costs $ 11,492 $ 3,941      
Deemed dividend recognized on beneficial conversion features of Series H redeemable convertible preferred stock (Note 8) $ 6,741 $ 6,741      
Deemed dividend from conversion of Series G to Series H redeemable convertible preferred stock (Note 8) (in shares) 97,592,739        
Deemed Dividend $ 6,860        
Conversion of preferred stock to common stock in connection with initial public offering (in shares) (1,012,573,679)        
Conversion of preferred stock to common stock in connection with initial public offering $ (138,906)        
Ending balance (in shares) at Dec. 31, 2019 0        
Ending balance at Dec. 31, 2019 $ 0        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Accretion of redeemable convertible preferred stock $ (4,640)     (4,640)  
Exercise of stock options (in Shares) 1,548   1,548    
Exercise of stock options $ 4     4  
Stock-based compensation 572     572  
Issuance of Series redeemable convertible preferred stock for aggregate proceeds of $____ per share, net of issuance costs of $___ (Note 8) 6,741     6,741  
Deemed dividend recognized on beneficial conversion features of Series H redeemable convertible preferred stock (6,741)     (6,741)  
Deemed dividend from conversion of Series G to Series H redeemable convertible preferred stock (6,860)     (6,860)  
Stock issued upon conversion of redeemable convertible preferred shares (in shares)     7,816,643    
Conversion of preferred stock to common stock in connection with initial public offering (Note 8) 138,906   $ 8 138,898  
Issuance of common stock in initial public offering, net of underwriting discount, commissions and issuance costs (Note 9) (in shares)     4,140,000    
Issuance of common stock in initial public offering, net of underwriting discount, commissions and issuance costs (Note 9) 50,444   $ 4 50,440  
Net exercise of common stock warrants (in shares)     539,794    
Net exercise of common and preferred stock warrants 511   $ 1 510  
Reclassification of redeemable convertible preferred stock warrant liabilities as equity 726     726  
Net loss $ (12,038)       (12,038)
Ending balance (in shares) at Dec. 31, 2019 12,560,990   12,560,990    
Ending balance at Dec. 31, 2019 $ 55,659   $ 13 $ 220,248 $ (164,602)