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Condensed Consolidated Statements of Convertible Preferred Stock, and Stockholders' Equity (Deficit) (Unaudited) - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Accumulated Deficit
Convertible Preferred Stock
Beginning balance at Dec. 31, 2018 $ (16,057) $ 1 $ 118 $ (16,176)  
Beginning balance, shares at Dec. 31, 2018         24,000,000
Beginning balance at Dec. 31, 2018         $ 23,073
Beginning balance, shares at Dec. 31, 2018   611,226      
Share-based compensation 35   35 0  
Net loss and comprehensive loss (4,439)   0 (4,439)  
Ending balance at Mar. 31, 2019 (20,461) $ 1 153 (20,615)  
Ending balance, shares at Mar. 31, 2019         24,000,000
Ending balance at Mar. 31, 2019         $ 23,073
Ending balance, shares at Mar. 31, 2019   611,226      
Beginning balance at Dec. 31, 2019 $ 89,944 $ 14 163,526 (73,596)  
Beginning balance, shares at Dec. 31, 2019 0       0
Beginning balance at Dec. 31, 2019         $ 0
Beginning balance, shares at Dec. 31, 2019   13,788,982      
Issuance of common stock upon exercise of stock options $ 9 $ 0 9 0  
Issuance of common stock upon exercise of stock options, shares 4,876 4,876      
Share-based compensation $ 493   493 0  
Net loss and comprehensive loss (10,544)   0 (10,544)  
Ending balance at Mar. 31, 2020 $ 79,902 $ 14 $ 164,028 $ (84,140)  
Ending balance, shares at Mar. 31, 2020 0       0
Ending balance at Mar. 31, 2020         $ 0
Ending balance, shares at Mar. 31, 2020   13,793,858