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CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Total | Preferred Stock | Common Stock | Additional Paid-In Capital | Accumulated Deficit
--- | --- | --- | --- | --- | ---
Beginning balance, amount at Dec. 31, 2015 | $ 23,404 | $ 2 | $ 27 | $ 42,859 | $ (19,484)
Beginning balance (in shares) at Dec. 31, 2015 |  | 1,976 | 27,051 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Options exercised, shares |  |  | 31 |  |
Options exercised, amount | 119 |  |  | 119 |
Warrants exercised, shares |  |  | 133 |  |
Warrants exercised, amount | 316 |  |  | 316 |
Stock based compensation | 533 |  |  | 533 |
Stock swap to acquire options and warrants, shares |  |  | (73) |  |
Stock swap to acquire options and warrants, amount | (315) |  |  | (315) |
Net loss | (3,428) |  |  |  | (3,428)
Ending balance, amount at Sep. 30, 2016 | 20,629 | $ 2 | $ 27 | 43,512 | (22,912)
Ending balance (in shares) at Sep. 30, 2016 |  | 1,976 | 27,142 |  |
Beginning balance, amount at Dec. 31, 2016 | 26,223 | $ 1 | $ 31 | 49,625 | (23,434)
Beginning balance (in shares) at Dec. 31, 2016 |  | 976 | 30,860 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Options exercised, shares |  |  | 21 |  |
Options exercised, amount | 275 |  |  | 275 |
Conversion of Series B convertible preferred to common stock, shares |  | (976) | 1,951 |  |
Conversion of Series B convertible preferred to common stock, amount | 0 | $ (1) | $ 2 | (1) |
Stock based compensation | 532 |  |  | 532 |
Stock swap to acquire options and warrants, shares |  |  | 0 |  |
Stock swap to acquire options and warrants, amount | (275) |  |  | (275) |
Net loss | (4,238) |  |  |  | (4,238)
Ending balance, amount at Sep. 30, 2017 | $ 22,517 | $ 0 | $ 33 | $ 50,156 | $ (27,672)
Ending balance (in shares) at Sep. 30, 2017 |  | 0 | 32,832 |  |

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