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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 |  |  |

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