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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY (DEFICIT) - USD ($) $ in Thousands | Total | Common Stock | Treasury Stock | Additional Paid-In Capital | Retained Earnings (Accumulated Deficit) | Accumulated Other Comprehensive Loss | Restricted Stock | Restricted Stock Common Stock | Restricted Stock Treasury Stock
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance (in shares) at Dec. 31, 2016 |  | 38,816,474 | 67,594 |  |  |  |  |  |
Beginning balance at Dec. 31, 2016 | $ 142,442 | $ 39 | $ (539) | $ 132,879 | $ 10,063 | $ 0 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |
Foreign currency translation adjustment | 0 |  |  |  |  |  |  |  |
Vesting of restricted stock (in shares) |  | 90,017 |  |  |  |  |  |  |
Proceeds from equity issuance, net of transaction costs (in shares) |  | 1,500,000 |  |  |  |  |  |  |
Proceeds from equity issuance, net of transaction costs | 24,169 |  |  | 24,168 |  |  |  |  |
Stock-based compensation | 1,973 |  |  | 1,973 |  |  |  |  |
Employee stock purchase plan compensation | 39 |  |  | 39 |  |  |  |  |
Restricted stock buy back (in shares) |  | 13,458 | 13,458 |  |  |  |  |  |
Restricted stock buy back | (127) |  | $ (127) |  |  |  |  |  |
Net income | 21,526 |  |  |  | 21,526 |  |  |  |
Ending balance (in shares) at Dec. 31, 2017 |  | 40,393,033 | 81,052 |  |  |  |  |  |
Ending balance at Dec. 31, 2017 | 190,022 | $ 40 | $ (666) | 159,059 | 31,589 | 0 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |
Foreign currency translation adjustment | (313) |  |  |  |  | (313) |  |  |
Vesting of restricted stock (in shares) |  | 177,464 |  |  |  |  | 177,000 |  |
Stock-based compensation | 2,937 |  |  | 2,937 |  |  |  |  |
Employee stock purchase plan compensation | 72 |  |  | 72 |  |  |  |  |
Employee stock purchase plan issuance (in shares) |  | 21,964 |  |  |  |  |  |  |
Employee stock purchase plan issuance | 127 |  |  | 127 |  |  |  |  |
Restricted stock buy back (in shares) |  | 588,200 | 588,200 |  |  |  |  | 29,783 | 29,783
Restricted stock buy back | (1,999) |  | $ (1,999) |  |  |  | $ (174) |  | $ (174)
Net income | 18,688 |  |  |  | 18,688 |  |  |  |
Ending balance (in shares) at Dec. 31, 2018 |  | 39,974,478 | 699,035 |  |  |  |  |  |
Ending balance at Dec. 31, 2018 | 209,360 | $ 40 | $ (2,839) | 162,195 | 50,277 | (313) |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |
Foreign currency translation adjustment | 272 |  |  |  |  | 272 |  |  |
Vesting of restricted stock (in shares) |  | 260,820 |  |  |  |  | 261,000 |  |
Stock-based compensation | 2,909 |  |  | 2,909 |  |  |  |  |
Employee stock purchase plan compensation | 41 |  |  | 41 |  |  |  |  |
Employee stock purchase plan issuance (in shares) |  | 41,075 |  |  |  |  |  |  |
Employee stock purchase plan issuance | 78 |  |  | 78 |  |  |  |  |
Restricted stock buy back (in shares) |  |  |  |  |  |  |  | 41,922 | 41,922
Restricted stock buy back |  |  |  |  |  |  | $ (140) |  | $ (140)
Net income | 31,623 |  |  |  | 31,623 |  |  |  |
Ending balance (in shares) at Dec. 31, 2019 |  | 40,234,451 | 740,957 |  |  |  |  |  |
Ending balance at Dec. 31, 2019 | $ 244,143 | $ 40 | $ (2,979) | $ 165,223 | $ 81,900 | $ (41) |  |  |

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