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Statements of Convertible Preferred Stock and Stockholders' Equity (Deficit) - USD ($)
$ in Thousands
Total
Convertible Preferred Stock
Common Stock
Additional Paid-in Capital
Accumulated Deficit
Balance at Dec. 31, 2018 $ (194,630) $ 183,962 $ 1 $ 2,107 $ (196,738)
Temporary Equity Balance, Shares at Dec. 31, 2018   110,071 215    
Common stock issued upon exercise of stock options 47     47  
Common stock issued upon exercise of stock options, shares     40    
Issuance of Series H Preferred Stock   $ 9,997      
Issuance of Series H Preferred Stock, shares   8,695      
Stock‑based compensation expense 170     170  
Net loss and comprehensive loss (30,726)       (30,726)
Balance at Dec. 31, 2019 $ (225,139) $ 193,959 $ 1 2,324 (227,464)
Temporary Equity Balance, Shares at Dec. 31, 2019 118,766,273 118,766 255    
Common stock issued upon exercise of stock options $ 1,340     1,340  
Common stock issued upon exercise of stock options, shares 368,000   368    
Stock‑based compensation expense $ 3,709     3,709  
Issuance of common stock in initial public offering, net of discounts and commission of $5,040 and direct offering costs of $3,203 63,757   $ 4 63,753  
Issuance of common stock in initial public offering, net of discounts and commission and direct offering costs, shares     4,000    
Conversion of preferred stock into common stock upon initial public offering 193,959 $ (193,959) $ 20 193,939  
Conversion of preferred stock into common stock, shares   (118,766) 20,091    
Conversion of convertible debt into common stock upon initial public offering 26,616   $ 2 26,614  
Conversion of convertible debt into common stock, shares     1,848    
Reclassification of preferred stock warrant liability and put option into additional paid-in capital upon initial public offering 8,274     8,274  
Net loss and comprehensive loss (31,350)       (31,350)
Balance at Dec. 31, 2020 $ 41,166   $ 27 $ 299,953 $ (258,814)
Temporary Equity Balance, Shares at Dec. 31, 2020 0   26,562