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STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-In Capital
Accumulated Other Comprehensive Loss
Accumulated Deficit
Beginning Balance, shares at Dec. 31, 2015   9,051,217      
Beginning Balance at Dec. 31, 2015 $ 38,070 $ 9 $ 134,128   $ (96,067)
Issuance of common stock upon vesting of Restricted Stock Units, shares   31,149      
Issuance of common stock upon vesting of Restricted Stock Units, value 0 $ 0 0 $ 0 0
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, shares at Dec. 31, 2016 9,082,366 9,082,366      
Ending Balance at Dec. 31, 2016 $ 22,194 $ 9 134,715 (19) (112,511)
Issuance of common stock for cash, net of offering costs, shares   85,068      
Issuance of common stock for cash, net of offering costs 69   69    
Issuance of common stock upon vesting of Restricted Stock Units, shares   5,434      
Issuance of common stock upon vesting of Restricted Stock Units, value 0 $ 0 0 0 0
Share-based compensation 101   101    
Change in unrealized loss on marketable securities 10     10  
Net loss $ (4,338)       (4,338)
Ending Balance, shares at Mar. 31, 2017 9,172,868 9,172,868      
Ending Balance at Mar. 31, 2017 $ 18,036 $ 9 $ 134,885 $ (9) $ (116,849)