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Redeemable Convertible Preferred Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Sep. 23, 2019
Jul. 31, 2019
Jan. 31, 2019
Sep. 30, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Temporary Equity [Line Items]              
Beneficial conversion feature, temporary equity           $ 6,741  
Deemed dividend from conversion of Series G to Series H redeemable convertible preferred stock (Note 7)       $ 6,900   $ 6,860  
Redeemable convertible preferred stock outstanding (in shares)         0 0 532,606,084
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]              
Sale of temporary equity, price per share (in dollars per share)     $ 0.078     $ 0.078  
Series H redeemable convertible preferred stock              
Temporary Equity [Line Items]              
Sale of temporary equity, price per share (in dollars per share)   $ 0.04712       $ 0.047  
Beneficial conversion feature, temporary equity       $ 6,700 $ 0 $ 6,741  
Redeemable Convertible Preferred Stock              
Temporary Equity [Line Items]              
Redeemable convertible preferred stock outstanding (in shares)         0 0