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Condensed Consolidated Statement of Stockholders Equity (Unaudited) - 9 months ended Sep. 30, 2018 - USD ($) $ in Thousands | Total | Convertible Preferred Stock | Common Stock | Additional Paid-In Capital | Accumulated Other Comprehensive Income (Loss) | Accumulated Deficit
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2017 | $ 30,774 |  | $ 6 | $ 204,262 |  | $ (173,494)
Balance (in shares) at Dec. 31, 2017 |  | 3,680 | 6,081,230 |  |  |
Opening balance adjustment - adoption of ASC 606 at Dec. 31, 2017 | 207 |  |  |  |  | 207
Balance at Dec. 31, 2017 | 30,981 |  | $ 6 | 204,262 |  | (173,287)
Stock-based compensation expense | 1,866 |  |  | 1,866 |  |
Issuance of common stock for follow-on offering, net of issuance costs | 106,762 |  | $ 4 | 106,758 |  |
Issuance of common stock for follow-on offering, net of issuance costs, shares |  |  | 3,382,352 |  |  |
Issuance of common stock upon exercise of warrants | 9,545 |  | $ 2 | 9,543 |  |
Issuance of common stock upon exercise of warrants, shares |  |  | 1,735,419 |  |  |
Conversion of preferred stock to common stock, shares |  | (3,680) | 736,000 |  |  |
Stock options exercised for common stock | $ 36 |  |  | 36 |  |
Stock options exercised for common stock, shares | 7,707 |  | 7,707 |  |  |
Conversion of redeemable convertible notes to common stock, value | $ 3 |  |  | 3 |  |
Conversion of redeemable convertible notes to common stock, shares |  |  | 21 |  |  |
Unrealized loss on available-for-sale securities | (24) |  |  |  | $ (24) |
Net loss | (19,218) |  |  |  |  | (19,218)
Balance at Sep. 30, 2018 | $ 129,951 |  | $ 12 | $ 322,468 | $ (24) | $ (192,505)
Balance (in shares) at Sep. 30, 2018 |  |  | 11,942,729 |  |  |

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