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Condensed Consolidated Statement of Stockholders Equity (Unaudited) - 9 months ended Sep. 30, 2018 - USD ($)
$ in Thousands
Total
Convertible Preferred Stock
Common Stock
Additional Paid-In Capital
Accumulated Other Comprehensive Income (Loss)
Accumulated Deficit
Balance at Dec. 31, 2017 $ 30,774   $ 6 $ 204,262   $ (173,494)
Balance (in shares) at Dec. 31, 2017   3,680 6,081,230      
Opening balance adjustment - adoption of ASC 606 at Dec. 31, 2017 207         207
Balance at Dec. 31, 2017 30,981   $ 6 204,262   (173,287)
Stock-based compensation expense 1,866     1,866    
Issuance of common stock for follow-on offering, net of issuance costs 106,762   $ 4 106,758    
Issuance of common stock for follow-on offering, net of issuance costs, shares     3,382,352      
Issuance of common stock upon exercise of warrants 9,545   $ 2 9,543    
Issuance of common stock upon exercise of warrants, shares     1,735,419      
Conversion of preferred stock to common stock, shares   (3,680) 736,000      
Stock options exercised for common stock $ 36     36    
Stock options exercised for common stock, shares 7,707   7,707      
Conversion of redeemable convertible notes to common stock, value $ 3     3    
Conversion of redeemable convertible notes to common stock, shares     21      
Unrealized loss on available-for-sale securities (24)       $ (24)  
Net loss (19,218)         (19,218)
Balance at Sep. 30, 2018 $ 129,951   $ 12 $ 322,468 $ (24) $ (192,505)
Balance (in shares) at Sep. 30, 2018     11,942,729