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Redeemable Convertible Preferred Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 15 Months Ended
Sep. 23, 2019
Jan. 31, 2018
Jul. 31, 2019
May 31, 2019
Mar. 31, 2019
Jan. 31, 2019
Jan. 31, 2018
Dec. 31, 2017
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Mar. 31, 2019
Jan. 02, 2019
Jan. 01, 2019
Temporary Equity [Line Items]                                    
Shares authorized (in shares)     1,038,667,059             955,500,000             955,500,000 750,300,000
Temporary Equity, Shares Redeemed upon Conversion                 1,012,573,679                  
Deemed Dividend                 $ 6,860                  
Beneficial conversion feature, temporary equity                 $ 6,741                  
Common Stock                                    
Temporary Equity [Line Items]                                    
Stock issued upon conversion of redeemable convertible preferred shares (in shares)                 7,816,643                  
Common Stock | IPO                                    
Temporary Equity [Line Items]                                    
Stock issued upon conversion of redeemable convertible preferred shares (in shares) 7,816,643                                  
Series G redeemable convertible preferred stock                                    
Temporary Equity [Line Items]                                    
Shares authorized (in shares)                                 205,200,000  
Number of shares sold, temporary equity       51,282,048 9,615,384 88,030,905                        
Sale of temporary equity, price per share (in dollars per share)           $ 0.078       $ 0.078 $ 0.078              
Proceeds from sale of temporary equity       $ 4,000                     $ 3,750 $ 7,600    
Deemed dividend from conversion of Series G to Series H redeemable convertible preferred stock (Note 8)                         $ 6,860 $ 0        
Right to require mandatory purchase, temporary equity       32,051,280                            
Consideration to be received under mandatory purchase, temporary equity       $ 2,500                            
Temporary Equity, Shares Redeemed upon Conversion     148,928,337                              
Series F redeemable convertible preferred stock                                    
Temporary Equity [Line Items]                                    
Number of shares sold, temporary equity   34,914,327           54,246,756                    
Sale of temporary equity, price per share (in dollars per share)             $ 0.078 $ 0.078       $ 0.078            
Proceeds from sale of temporary equity   $ 2,700           $ 4,200                    
Deemed Dividend                       $ 1,200            
Series H redeemable convertible preferred stock                                    
Temporary Equity [Line Items]                                    
Shares authorized (in shares)     479,967,595                              
Number of shares sold, temporary equity     233,446,519                              
Sale of temporary equity, price per share (in dollars per share)     $ 0.04712           $ 0.047                  
Proceeds from sale of temporary equity     $ 11,000                              
Shares issued upon conversion, temporary equity (in shares)     246,521,076                              
Beneficial conversion feature, temporary equity                 $ 6,700       $ 6,741 $ 0