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Condensed Statement of Redeemable Convertible Preferred Stock and Stockholders' Deficit (Unaudited) - 9 months ended Sep. 30, 2018 - USD ($)
$ in Thousands
Redeemable Convertible Preferred Stock [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Deficit [Member]
Total
Balance at Dec. 31, 2017 $ 19,004 $ 6 $ 1,759 $ (8,639) $ (6,874)
Balance, shares at Dec. 31, 2017 6,685,082 6,000,000      
Stock-based compensation 1,631 1,631
Stock-based compensation, shares 218,980      
Accrued dividends on redeemable convertible preferred stock $ 900     (900) (900)
Accrued dividends on redeemable convertible preferred stock, shares        
Deemed dividends for accretion of redeemable convertible preferred stock issuance costs $ 1,257 (1,257) (1,257)
Deemed dividends for accretion of redeemable convertible preferred stock issuance costs, shares        
Net loss (9,010) (9,010)
Balance at Sep. 30, 2018 $ 21,161 $ 6 $ 3,390 $ (19,806) $ (16,410)
Balance, shares at Sep. 30, 2018 6,685,082 6,218,980