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Condensed Consolidated Statement of Stockholders Equity (Unaudited) - 3 months ended Mar. 31, 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 606     606    
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, shares 59   59      
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 (4)       $ (4)  
Net loss (5,042)         (5,042)
Balance at Mar. 31, 2018 $ 142,851   $ 12 $ 321,172 $ (4) $ (178,329)
Balance (in shares) at Mar. 31, 2018     11,935,081