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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-in | Treasury Stock | Accumulated Deficit
--- | --- | --- | --- | --- | ---
Balance, beginning of period at Dec. 31, 2012 | $ 20,007 | $ 88 | $ 89,627 | $ (25) | $ (69,683)
Balance, beginning of period (in shares) at Dec. 31, 2012 |  | 88,423,169 |  | 50,000 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Share-based compensation expense | 6,010 |  | 6,010 |  |
Exercise of stock options | 1,981 | $ 2 | 1,979 |  |
Exercise of stock options (in shares) |  | 1,958,674 |  |  |
Exercise of warrants | 2,108 | $ 2 | 2,106 |  |
Exercise of warrants (in shares) |  | 1,844,352 |  |  |
Common stock issued for 5% convertible note | $ 5,272 | $ 5 | 5,267 |  |
Common stock issued for 5% convertible note (in shares) | 5,272,004 | 5,272,004 |  |  |
Common stock issued for earn - out liability | $ 5,792 | $ 1 | 5,791 |  |
Common stock issued for earn-out liability (in shares) | 1,174,915 | 1,174,915 |  |  |
Issuance of restricted stock | $ 0 |  |  |  |
Issuance of restricted stock (in shares) |  | 2,500 |  |  |
Public offering of common stock, net of expenses | 36,510 | $ 6 | 36,504 |  |
Public offering of common stock, net of expenses (in shares) |  | 5,750,000 |  |  |
Shares issued for services performed | 0 |  |  |  |
Net income (loss) | (4,112) |  |  |  | (4,112)
Balance, end of period at Dec. 31, 2013 | 73,568 | $ 104 | 147,284 | $ (25) | (73,795)
Balance, end of period (in shares) at Dec. 31, 2013 |  | 104,425,614 |  | 50,000 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Share-based compensation expense | 11,453 |  | 11,453 |  |
Exercise of stock options | 2,470 | $ 2 | 2,468 |  |
Exercise of stock options (in shares) |  | 1,653,690 |  |  |
Exercise of warrants | 1,113 | $ 1 | 1,112 |  |
Exercise of warrants (in shares) |  | 1,242,416 |  |  |
Common stock issued for 5% convertible note | 0 |  |  |  |
Common stock issued for earn - out liability | 0 |  |  |  |
Issuance of restricted stock | 0 | $ 1 | (1) |  |
Issuance of restricted stock (in shares) |  | 1,438,569 |  |  |
Shares issued for services performed | $ 117 |  | 117 |  |
Shares issued for services performed (in shares) | 15,958 | 15,958 |  |  |
Stock repurchase | $ (5,612) |  |  | $ (5,612) |
Stock repurchase (in shares) |  |  |  | 936,636 |
Net income (loss) | 6,220 |  |  |  | 6,220
Balance, end of period at Dec. 31, 2014 | 89,329 | $ 108 | 162,433 | $ (5,637) | (67,575)
Balance, end of period (in shares) at Dec. 31, 2014 |  | 108,776,247 |  | 986,636 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Share-based compensation expense | 16,896 |  | 16,896 |  |
Tax benefit of share-based compensation expense | 7,757 |  | 7,757 |  |
Exercise of stock options | $ 4,629 | $ 1 | (9,792) | $ 14,420 |
Exercise of stock options (in shares) | 2,220,881 | 647,656 |  | (1,573,225) |
Exercise of warrants | $ 46 |  | (379) | $ 425 |
Exercise of warrants (in shares) |  |  |  | (42,400) |
Common stock issued for 5% convertible note | 0 |  |  |  |
Common stock issued for earn - out liability | 0 |  |  |  |
Issuance of restricted stock | 0 |  | (14,547) | $ 14,547 |
Issuance of restricted stock (in shares) |  | 34,250 |  | (1,940,009) |
Restricted stock shares canceled/forfeited | $ 0 |  | 652 | $ (652) |
Restricted stock shares canceled/forfeited (in shares) | 69,949 | (2,058) |  |  |
Shares issued for services performed | $ 164 |  | 113 | $ 51 |
Shares issued for services performed (in shares) | 16,493 | 11,321 |  | (5,172) |
Stock repurchase | $ (40,279) |  |  | $ (40,279) |
Stock repurchase (in shares) | 4,610,000 |  |  | 4,610,166 |
Net income (loss) | $ 29,446 |  |  |  | 29,446
Balance, end of period at Dec. 31, 2015 | $ 107,988 | $ 109 | $ 163,133 | $ (17,125) | $ (38,129)
Balance, end of period (in shares) at Dec. 31, 2015 |  | 109,467,416 |  | 2,105,945 |

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