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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - 9 months ended Sep. 30, 2016 - USD ($) $ in Thousands | Total | Common Stock | Additional Paid - in Capital | Treasury Stock | Accumulated Deficit
--- | --- | --- | --- | --- | ---
Balance, beginning of period at Dec. 31, 2015 | $ 107,988 | $ 109 | $ 163,133 | $ (17,124) | $ (38,130)
Balance (in shares) at Dec. 31, 2015 |  | 109,467,416 |  | 2,105,945 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Share-based compensation expense | 13,826 |  | 13,826 |  |
Exercise of stock options | $ 2,548 |  | (2,957) | $ 5,505 |
Exercise of stock options (in shares) | 926,010 | 243,928 |  | (682,082) |
Issuance of restricted stock | $ 0 | $ 1 | (14,676) | $ 14,675 |
Issuance of restricted stock (in shares) |  | 501,203 |  | (1,825,329) |
Restricted stock shares cancelled/forfeited | 0 |  | 1,070 | $ (1,070) |
Restricted stock shares cancelled/forfeited (in shares) |  |  |  | 137,575 |
Shares issued for services performed | $ 346 |  | 6 | $ 340 |
Shares issued for services performed (in shares) | 43,344 |  |  | (43,344) |
Stock repurchase | $ (10,378) |  |  | $ (10,378) |
Stock repurchase (in shares) | 1,338,616 |  |  | 1,338,616 |
Shares repurchased for tax withholding | $ (892) |  |  | $ (892) |
Shares repurchased for tax withholding (in shares) |  |  |  | 109,394 |
Shares issued in conjunction with acquisition | $ 3,346 |  | (462) | $ 3,808 |
Shares issued in conjunction with acquisition (in shares) | 441,009 |  |  | (441,009) |
Net income | $ 6,493 |  |  |  | 6,493
Balance, end of period at Sep. 30, 2016 | $ 123,277 | $ 110 | $ 159,940 | $ (5,136) | $ (31,637)
Balance (in shares) at Sep. 30, 2016 |  | 110,212,547 |  | 699,766 |

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