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Statements of Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) - USD ($)
$ in Thousands
Redeemable Convertible Preferred Stock [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Deficit [Member]
Total
Balance at Apr. 26, 2017  
Balance, shares at Apr. 26, 2017        
Temporary equity balance at Apr. 26, 2017        
Temporary equity balance, shares at Apr. 26, 2017        
Common stock issued to founder   $ 4 4
Common stock issued to founder, shares   3,500,000      
Stock-based compensation   $ 2 1,759 1,761
Stock-based compensation, shares   2,500,000      
Issuance of Series A redeemable convertible preferred stock, net of issuance costs $ 17,521
Issuance of Series A redeemable convertible preferred stock, net of issuance costs, shares 6,685,082        
Accrued dividends on redeemable convertible preferred stock $ 643 (643) (643)
Accrued dividends on redeemable convertible preferred stock, shares        
Deemed dividends for accretion of redeemable convertible preferred stock issuance costs $ 840 (840) (840)
Deemed dividends for accretion of redeemable convertible preferred stock issuance costs, shares        
Net loss (7,156) (7,156)
Balance at Dec. 31, 2017   $ 6 1,759 (8,639) $ (6,874)
Balance, shares at Dec. 31, 2017   6,000,000      
Temporary equity balance at Dec. 31, 2017 $ 19,004        
Temporary equity balance, shares at Dec. 31, 2017 6,685,082       6,685,082
Stock-based compensation 1,850 $ 1,850
Stock-based compensation, shares 218,980      
Accrued dividends on redeemable convertible preferred stock $ 1,048 (1,048) (1,048)
Accrued dividends on redeemable convertible preferred stock, shares        
Deemed dividends for accretion of redeemable convertible preferred stock issuance costs $ 1,694 (1,694) (1,694)
Deemed dividends for accretion of redeemable convertible preferred stock issuance costs, shares        
Issuance of common stock in connection with initial public offering, including underwriter's over-allotment, net of offering costs and underwriter's discount   $ 4 21,956 21,960
Issuance of common stock in connection with initial public offering, including underwriter's over-allotment, net of offering costs and underwriter's discount, shares   4,140,000      
Conversion of redeemable convertible preferred stock (including accrued dividends) to common stock in connection with initial public offering $ (21,746) $ 8 21,738 21,746
Conversion of redeemable convertible preferred stock (including accrued dividends) to common stock in connection with initial public offering, shares (6,685,082) 7,248,948      
Reclassification of common stock warrants from liability to additional paid-in-capital 3,103 3,103
Beneficial conversion feature on redeemable convertible preferred stock 21,747 (21,747)
Net loss (12,740) (12,740)
Balance at Dec. 31, 2018   $ 18 $ 72,153 $ (45,868) $ 26,303
Balance, shares at Dec. 31, 2018   17,607,928      
Temporary equity balance at Dec. 31, 2018        
Temporary equity balance, shares at Dec. 31, 2018