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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, 2017 $ 10,275 $ 1 $ 141,277 $ (2) $ (131,001)
Beginning Balance, shares at Dec. 31, 2017   654,170      
Issuance of common stock for cash, net of offering costs 3,415   3,415    
Issuance of common stock for cash, net of offering costs, shares   118,546      
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   842      
Share-based compensation 273   273    
Change in unrealized loss on marketable securities 2     $ 2  
Net loss (7,933)       (7,933)
Ending Balance at Dec. 31, 2018 $ 6,032 $ 1 144,965   (138,934)
Ending Balance, shares at Dec. 31, 2018 773,558 773,558      
Issuance of common stock for cash, net of offering costs $ 6,909 $ 1 6,908    
Issuance of common stock for cash, net of offering costs, shares   820,561      
Adjustment for fractional shares   (49)      
Share-based compensation 151   151    
Net loss (5,482)       (5,482)
Ending Balance at Dec. 31, 2019 $ 7,610 $ 2 $ 152,024   $ (144,416)
Ending Balance, shares at Dec. 31, 2019 1,594,070 1,594,070