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Unaudited Condensed Statements of Redeemable Convertible Preferred Stock and Stockholders' Equity - USD ($)
$ in Thousands
Total
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 $ 1,382      
Issuance of Series G redeemable convertible preferred stock for aggregate proceeds, net of issuance costs (in shares) 34,914,327      
Issuance of Series G redeemable convertible preferred stock for aggregate proceeds, net of issuance costs $ 3,868      
Ending balance (in shares) at Mar. 31, 2018 532,606,084      
Ending balance at Mar. 31, 2018 $ 97,296      
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 1,382   1,382  
Stock-based compensation 46   46  
Issuance of Series H redeemable convertible preferred stock for aggregate proceeds of $0.047 per share, net of issuance costs of $318 (Note 8) (1,152)   (1,152)  
Net loss (2,793)     (2,793)
Ending balance (in shares) at Mar. 31, 2018   63,005    
Ending balance at Mar. 31, 2018 $ (98,879) $ 0 48,466 (147,345)
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 $ 6,462      
Ending balance (in shares) at Sep. 30, 2018 532,606,084      
Ending balance at Sep. 30, 2018 $ 102,376      
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]        
Net loss (6,695)      
Ending balance (in shares) at Sep. 30, 2018   63,005    
Ending balance at Sep. 30, 2018 $ (107,807) $ 0 43,440 (151,247)
Beginning balance (in shares) at Mar. 31, 2018 532,606,084      
Beginning balance at Mar. 31, 2018 $ 97,296      
Increase (Decrease) in Temporary Equity [Roll Forward]        
Accretion of redeemable convertible preferred stock $ 2,312      
Ending balance (in shares) at Jun. 30, 2018 532,606,084      
Ending balance at Jun. 30, 2018 $ 99,608      
Beginning balance (in shares) at Mar. 31, 2018   63,005    
Beginning balance at Mar. 31, 2018 (98,879) $ 0 48,466 (147,345)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Accretion of redeemable convertible preferred stock 2,312   2,312  
Stock-based compensation 44   44  
Net loss (2,146)     (2,146)
Ending balance (in shares) at Jun. 30, 2018   63,005    
Ending balance at Jun. 30, 2018 (103,293) $ 0 46,198 (149,491)
Increase (Decrease) in Temporary Equity [Roll Forward]        
Accretion of redeemable convertible preferred stock $ 2,768      
Ending balance (in shares) at Sep. 30, 2018 532,606,084      
Ending balance at Sep. 30, 2018 $ 102,376      
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Accretion of redeemable convertible preferred stock 2,768   2,768  
Stock-based compensation 10   10  
Net loss (1,756)     (1,756)
Ending balance (in shares) at Sep. 30, 2018   63,005    
Ending balance at Sep. 30, 2018 $ (107,807) $ 0 43,440 (151,247)
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 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)
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 $ 4,640      
Ending balance (in shares) at Sep. 30, 2019 0      
Ending balance at Sep. 30, 2019 $ 0      
Beginning balance (in shares) at Dec. 31, 2018 63,005 63,005    
Beginning balance at Dec. 31, 2018 $ (111,966) $ 0 40,598 (152,564)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Exercise of stock options (in Shares) 50      
Net loss $ (8,630)      
Ending balance (in shares) at Sep. 30, 2019 12,559,492 12,559,492    
Ending balance at Sep. 30, 2019 $ 58,650 $ 13 219,831 (161,194)
Beginning balance (in shares) at Mar. 31, 2019 630,252,373      
Beginning balance at Mar. 31, 2019 $ 114,866      
Increase (Decrease) in Temporary Equity [Roll Forward]        
Accretion of redeemable convertible preferred stock $ 2,188      
Issuance of Series G redeemable convertible preferred stock for aggregate proceeds, net of issuance costs (in shares) 51,282,048      
Issuance of Series G redeemable convertible preferred stock for aggregate proceeds, net of issuance costs $ 3,972      
Ending balance (in shares) at Jun. 30, 2019 681,534,421      
Ending balance at Jun. 30, 2019 $ 121,026      
Beginning balance (in shares) at Mar. 31, 2019   63,029    
Beginning balance at Mar. 31, 2019 (116,772) $ 0 38,496 (155,268)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Accretion of redeemable convertible preferred stock 2,188   2,188  
Exercise of stock options (in Shares)   26    
Exercise of stock options 0 $ 0    
Stock-based compensation 11   11  
Net loss (2,785)     (2,785)
Ending balance (in shares) at Jun. 30, 2019   63,055    
Ending balance at Jun. 30, 2019 (121,734) $ 0 36,319 (158,053)
Increase (Decrease) in Temporary Equity [Roll Forward]        
Accretion of redeemable convertible preferred stock $ 338      
Issuance of Series G redeemable convertible preferred stock for aggregate proceeds, net of issuance costs (in shares) 233,446,519      
Issuance of Series G redeemable convertible preferred stock for aggregate proceeds, net of issuance costs $ 3,941      
Deemed dividend recognized on beneficial conversion features of Series H redeemable convertible preferred stock (Note 8) $ 6,741      
Deemed dividend from conversion of Series G to Series H redeemable convertible preferred stock (Note 8) (in shares) 97,592,739      
Conversion of preferred stock to common stock in connection with initial public offering (Note 8) (in shares) 1,012,573,679      
Conversion of preferred stock to common stock in connection with initial public offering (Note 8) $ 138,906      
Ending balance (in shares) at Sep. 30, 2019 0      
Ending balance at Sep. 30, 2019 $ 0      
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Accretion of redeemable convertible preferred stock 338   338  
Stock-based compensation 62   62  
Issuance of Series H redeemable convertible preferred stock for aggregate proceeds of $0.047 per share, net of issuance costs of $318 (Note 8) 6,741   6,741  
Deemed dividend recognized on beneficial conversion features of Series H redeemable convertible preferred stock (Note 8) 6,741   6,741  
Deemed Dividend 6,860      
Deemed dividend from conversion of Series G to Series H redeemable convertible preferred stock (Note 8) 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) 50,518 $ 4 50,514  
Net exercise of common stock warrants (in shares)   539,794    
Net exercise of common stock warrants 511 $ 1 510  
Reclassification of redeemable convertible preferred stock warrant liabilities as equity 726   726  
Net loss $ (3,141)     (3,141)
Ending balance (in shares) at Sep. 30, 2019 12,559,492 12,559,492    
Ending balance at Sep. 30, 2019 $ 58,650 $ 13 $ 219,831 $ (161,194)