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Condensed Consolidated Statement of Stockholders Equity (Unaudited) - 6 months ended Jun. 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 1,156     1,156    
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 gain on available-for-sale securities 4       $ 4  
Net loss (11,524)         (11,524)
Balance at Jun. 30, 2018 $ 136,963   $ 12 $ 321,758 $ 4 $ (184,811)
Balance (in shares) at Jun. 30, 2018     11,942,729