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Temporary Equity and Stockholders' Deficit - Schedule of Temporary Equity (Details) - shares
Sep. 30, 2019
Jul. 31, 2019
Jun. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Ordinary shares, authorized 490,000,000     490,000,000 [1]      
Ordinary shares, issued 31,201,669     31,201,669 [1]      
Ordinary shares, outstanding 273,049     273,049 [1]      
Temporary equity, shares authorized     24,989,502      
Temporary equity, shares issued 30,928,620   20,008,036      
Temporary equity, shares outstanding     20,008,036      
Preferred Stock A-1 [Member]              
Temporary equity, shares authorized     199,929 [1]      
Temporary equity, shares issued   199,870 199,870 [1] 199,870 199,870 199,870
Temporary equity, shares outstanding     199,870 [1]      
Preferred Stock A-2 [Member]              
Temporary equity, shares authorized     4,881,762 [1]      
Temporary equity, shares issued   4,881,654 4,881,654 [1] 4,881,654 4,881,654 4,881,654
Temporary equity, shares outstanding     4,881,654 [1]      
Preferred Stock B [Member]              
Temporary equity, shares authorized     4,556,154 [1]      
Temporary equity, shares issued   4,556,094 4,556,094 [1] 4,556,094 4,556,094 4,556,094
Temporary equity, shares outstanding     4,556,094 [1]      
Prefered Stock C [Member]              
Temporary equity, shares authorized     12,141,116 [1]      
Temporary equity, shares issued   7,222,305 7,222,305 [1] 7,222,305 7,222,305 7,222,305
Temporary equity, shares outstanding     7,222,305 [1]      
Preferred Stock C-1 [Member]              
Temporary equity, shares authorized     2,756,158 [1]      
Temporary equity, shares issued   2,755,706 2,755,706 [1] 2,755,706 2,755,706 2,755,706
Temporary equity, shares outstanding     2,755,706 [1]      
Preferred Stock C-2 [Member]              
Temporary equity, shares authorized     454,383 [1]      
Temporary equity, shares issued   1 392,407 [1]
Temporary equity, shares outstanding     392,407 [1]      
[1] The number of shares prior to the reverse capitalization have been retroactively adjusted based on the equivalent number of shares received by the accounting acquirer in the Recapitalization Transaction.