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STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-In Capital
Accumulated Other Comprehensive Loss
Accumulated Deficit
Beginning Balance at Dec. 31, 2015 $ 38,070 $ 9 $ 134,128   $ (96,067)
Beginning Balance, shares at Dec. 31, 2015   9,051,217      
Issuance of common stock upon vesting of Restricted Stock Units, value 0 $ 0 0 $ 0 0
Issuance of common stock upon vesting of Restricted Stock Units, shares   31,149      
Share-based compensation 576   576    
Change in unrealized loss on marketable securities (19)     (19)  
Other 11   11    
Net loss (16,444)       (16,444)
Ending Balance at Dec. 31, 2016 $ 22,194 $ 9 134,715 (19) (112,511)
Ending Balance, shares at Dec. 31, 2016 9,082,366 9,082,366      
Issuance of common stock for cash, net of offering costs $ 6,096 $ 3 6,093    
Issuance of common stock for cash, net of offering costs, shares   2,677,525      
Issuance of common stock upon vesting of Restricted Stock Units, value 0 $ 0 0 0 0
Issuance of common stock upon vesting of Restricted Stock Units, shares   15,171      
Share-based compensation 458   458    
Change in unrealized loss on marketable securities 17     17  
Net loss (18,490)       (18,490)
Ending Balance at Dec. 31, 2017 $ 10,275 $ 12 $ 141,266 $ (2) $ (131,001)
Ending Balance, shares at Dec. 31, 2017 11,775,062 11,775,062