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Unaudited Condensed Statements of Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2018 532,606,084      
Beginning balance at Dec. 31, 2018 $ 105,232      
Increase (Decrease) in Temporary Equity [Roll Forward]        
Accretion of redeemable convertible preferred stock $ 2,114      
Issuance of Series G redeemable convertible preferred stock for aggregate proceeds, net of issuance costs (in shares) 97,646,289      
Issuance of Series G redeemable convertible preferred stock for aggregate proceeds, net of issuance costs $ 7,520      
Ending balance (in shares) at Mar. 31, 2019 630,252,373      
Ending balance at Mar. 31, 2019 $ 114,866      
Beginning balance (in shares) at Dec. 31, 2018   63,005    
Beginning balance at Dec. 31, 2018 (111,966) $ 0 $ 40,598 $ (152,564)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Accretion of redeemable convertible preferred stock (2,114)   (2,114)  
Exercise of stock options (in shares)   24    
Exercise of stock options 0 $ 0    
Stock-based compensation 12   12  
Net loss (2,704)     (2,704)
Ending balance (in shares) at Mar. 31, 2019   63,029    
Ending balance at Mar. 31, 2019 (116,772) $ 0 38,496 (155,268)
Increase (Decrease) in Temporary Equity [Roll Forward]        
Accretion of redeemable convertible preferred stock $ 0      
Beginning balance (in shares) at Dec. 31, 2019 12,560,990 12,560,990    
Beginning balance at Dec. 31, 2019 $ 55,659 $ 13 220,248 (164,602)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Exercise of stock options (in shares) 43,700 43,700    
Exercise of stock options $ 10   10  
Stock-based compensation 431   431  
Net exercise of common stock warrants (in shares)   22,366    
Net exercise of common stock warrants 0      
Net loss $ (5,563)     (5,563)
Ending balance (in shares) at Mar. 31, 2020 12,627,056 12,627,056    
Ending balance at Mar. 31, 2020 $ 50,537 $ 13 $ 220,689 $ (170,165)