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CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Preferred Stock | Common Stock | Additional Paid-In Capital | Accumulated Deficit | Total
--- | --- | --- | --- | --- | ---
Beginning Balance, Shares at Dec. 31, 2013 |  | 17,684,000 |  |  |
Beginning Balance, Amount at Dec. 31, 2013 | $ 0 | $ 18 | $ 28,687 | $ (9,634) | $ 19,071
Options exercised, Shares |  | 221,000 |  |  |
Options exercised, Amount |  |  | 469 |  | 469
Stock based compensation |  |  | 388 |  | 388
Stock swap to acquire options, Shares |  | (51,000) |  |  |
Stock swap to acquire options, Amount |  |  | (210) |  | (210)
Accretion on convertible preferred stock |  |  |  | (932) | (932)
Net income (loss) |  |  |  | (17,282) | (17,282)
Ending Balance, Shares at Dec. 31, 2014 |  | 17,852,000 |  |  |
Ending Balance, Amount at Dec. 31, 2014 | $ 0 | $ 18 | 29,334 | (27,848) | 1,504
Options exercised, Shares |  | 98,000 |  |  |
Options exercised, Amount |  |  | 220 |  | 220
Warrant exercised, Shares |  | 739,000 |  |  |
Warrant exercised, Amount |  |  | 1,519 |  | 1,519
Issuance of common stock, Shares |  | 5,219,000 |  |  |
Issuance of common stock, Amount |  | $ 5 | 11,526 |  | 11,531
Conversion of Series A Preferred stock and common warrants to Series B preferred stock, Shares | 3,588,000 |  |  |  |
Conversion of Series A Preferred stock and common warrants to Series B preferred stock, Amount | $ 4 |  | (40) | 13,956 | 13,920
Conversion of Series B convertible preferred to common stock, Shares | (1,612,000) | 3,225,000 |  |  |
Conversion of Series B convertible preferred to common stock, Amount | $ (2) | $ 4 | (2) |  |
Stock based compensation |  |  | 575 |  | 575
Stock swap to acquire options, Shares |  | (81,000) |  |  |
Stock swap to acquire options, Amount |  |  | (273) |  | (273)
Accretion on convertible preferred stock |  |  |  | (222) | (222)
Net income (loss) |  |  |  | (5,370) | (5,370)
Ending Balance, Shares at Dec. 31, 2015 | 1,976,000 |  |  |  |
Ending Balance, Amount at Dec. 31, 2015 | $ 2 | $ 27 | $ 42,859 | $ (19,484) | $ 23,404

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