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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 at Dec. 31, 2016 $ 22,194 $ 9 $ 134,715 $ (19) $ (112,511)
Beginning Balance, shares at Dec. 31, 2016   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      
Issuance of common stock for cash, net of offering costs $ 3,415 $ 2 3,413    
Issuance of common stock for cash, net of offering costs, shares   2,133,828      
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   5,430      
Share-based compensation 97   97    
Change in unrealized loss on marketable securities 2     $ 2  
Net loss (2,735)       (2,735)
Ending Balance at Mar. 31, 2018 $ 11,054 $ 14 $ 144,776   $ (133,736)
Ending Balance, shares at Mar. 31, 2018 13,914,320 13,914,320