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Condensed Consolidated Statements of Redeemable Preferred Stock and Stockholders' Equity (Deficit) - USD ($)
$ in Thousands
Redeemable convertible preferred stock (as converted to common stock)
Series A Preferred Stock
Common Stock
Treasury Stock
Additional Paid-In-Capital
Accumulated Deficit
Total
Balance at beginning at Dec. 31, 2017 $ 5,000         $ (4,564) $ (4,564)
Balance at beginning (in shares) at Dec. 31, 2017 5,000,000   226,400        
Issuance of treasury stock as founders' stock (in shares)     75,467 (75,467)      
Issuance of stock   $ 8,787          
Issuance of stock (in shares)   17,653,333          
Accretion of redeemable convertible preferred stock to redemption value $ 70         70 70
Net loss and comprehensive loss           (9,094) (9,094)
Balance at ending at Jun. 30, 2018 $ 13,857         (13,728) (13,728)
Balance at ending (in shares) at Jun. 30, 2018 22,653,333   226,400        
Repurchase of founders' stock (in shares)     (75,467) 75,467      
Balance at beginning at Dec. 31, 2018 $ 124,728   $ 0   $ 36,646 (86,565) (49,919)
Balance at beginning (in shares) at Dec. 31, 2018 64,730,410   238,986        
Conversion of convertible preferred stock into common stock upon closing of initial public offering $ (124,728)   $ 2   124,726   124,728
Conversion of convertible preferred stock into common stock upon closing of initial public offering (in shares) (64,730,410)   21,056,136        
Issuance of stock     $ 1   95,452   95,453
Issuance of stock (in shares)     6,612,500        
Issuance of restricted common stock upon early exercise of stock options (in shares)     487,933        
Exercise of stock options         100   $ 100
Exercise of stock options (in shares)     159,824       647,757
Stock-based compensation expense         617   $ 617
Net loss and comprehensive loss           (12,590) (12,590)
Balance at ending at Jun. 30, 2019     $ 3   $ 257,541 $ (99,155) $ 158,389
Balance at ending (in shares) at Jun. 30, 2019     28,555,379