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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Total | Preferred Stock | Common Stock | Additional Paid-in Capital | Retained Earnings
--- | --- | --- | --- | --- | ---
Beginning balance (in shares) at Dec. 31, 2013 |  | 0 | 17,684 |  |
Beginning balance, amount at Dec. 31, 2013 | $ 19,071 | $ 0 | $ 18 | $ 28,687 | $ (9,634)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Options exercised (in shares) |  |  | 107 |  |
Options exercised | 232 |  |  | 232 |
Warrants exercised (in shares) |  |  | 112 |  |
Warrants exercised | 237 |  |  | 237 |
Stock based compensation | 388 |  |  | 388 |
Stock swap to acquire options and warrants (in shares) |  |  | (51) |  |
Stock swap to acquire options and warrants | (210) |  |  | (210) |
Accretion on convertible preferred stock | (932) |  |  |  | (932)
Net loss | (17,282) |  |  |  | (17,282)
Ending balance (in shares) at Dec. 31, 2014 |  | 0 | 17,852 |  |
Ending balance, amount at Dec. 31, 2014 | 1,504 | $ 0 | $ 18 | 29,334 | (27,848)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Options exercised (in shares) |  |  | 98 |  |
Options exercised | 220 |  |  | 220 |
Warrants exercised (in shares) |  |  | 739 |  |
Warrants exercised | 1,519 |  |  | 1,519 |
Issuance of common stock (in shares) |  |  | 5,219 |  |
Issuance of common stock | 11,531 |  | $ 5 | 11,526 |
Conversion of Series A Preferred stock and common warrants to Series B preferred stock (in shares) |  | 3,588 |  |  |
Conversion of Series A preferred stock and common warrants to Series B preferred stock | 13,920 | $ 4 |  | (40) | 13,956
Conversion of Series B convertible preferred to common stock (in shares) |  | (1,612) | 3,225 |  |
Conversion of Series B convertible preferred to common stock | 0 | $ (2) | $ 4 | (2) |
Stock based compensation | 575 |  |  | 575 |
Stock swap to acquire options and warrants (in shares) |  |  | (81) |  |
Stock swap to acquire options and warrants | (273) |  |  | (273) |
Accretion on convertible preferred stock | (222) |  |  |  | (222)
Net loss | (5,370) |  |  |  | (5,370)
Ending balance (in shares) at Dec. 31, 2015 |  | 1,976 | 27,052 |  |
Ending balance, amount at Dec. 31, 2015 | 23,404 | $ 2 | $ 27 | 42,859 | (19,484)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Options exercised (in shares) |  |  | 36 |  |
Options exercised | 130 |  |  | 130 |
Warrants exercised (in shares) |  |  | 293 |  |
Warrants exercised | 698 |  |  | 698 |
Issuance of common stock (in shares) |  |  | 1,625 |  |
Issuance of common stock | 5,830 |  | $ 2 | 5,828 |
Conversion of Series B convertible preferred to common stock (in shares) |  | (1,000) | 2,000 |  |
Conversion of Series B convertible preferred to common stock | 0 | $ (1) | $ 2 | (1) |
Stock based compensation | 809 |  |  | 809 |
Stock swap to acquire options and warrants (in shares) |  |  | (146) |  |
Stock swap to acquire options and warrants | (698) |  |  | (698) |
Net loss | (3,950) |  |  |  | (3,950)
Ending balance (in shares) at Dec. 31, 2016 |  | 976 | 30,860 |  |
Ending balance, amount at Dec. 31, 2016 | $ 26,223 | $ 1 | $ 31 | $ 49,625 | $ (23,434)

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