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Consolidated Statements of Changes in Convertible Preferred Stock - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Increase (Decrease) in Convertible Preferred Stock    
Balance at beginning of period $ 106,237 $ 108,312
Balance at beginning of period (in shares) 65,428,088 66,630,284
Repurchase of convertible preferred stock   $ (2,075)
Repurchase of convertible preferred stock (in shares)   (1,202,196)
Conversion of Convertible Preferred Stock to Common Stock upon initial public offering $ (106,237)  
Conversion of Convertible Preferred Stock to Common Stock upon initial public offering (in shares) (65,428,088)  
Balance at end of period   $ 106,237
Balance at end of period (in shares)   65,428,088