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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY (UNAUDITED) - USD ($) $ in Thousands | Total | Common Stock | Treasury Stock | Additional Paid-in Capital | Retained Earnings | Accumulated Other Comprehensive Loss
--- | --- | --- | --- | --- | --- | ---
Beginning balance (in shares) at Dec. 31, 2017 |  | 40,393,033 | 81,052 |  |  |
Beginning balance at Dec. 31, 2017 | $ 190,022 | $ 40 | $ (666) | $ 159,059 | $ 31,589 | $ 0
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Foreign currency translation adjustment | 0 |  |  |  |  |
Vesting of restricted stock (in shares) |  | 96,713 |  |  |  |
Stock-based compensation | 610 |  |  | 610 |  |
Employee stock purchase plan issuance (in shares) |  | 9,639 |  |  |  |
Employee stock purchase plan issuance | 70 |  |  | 70 |  |
Restricted stock buy back (in shares) |  | (8,822) | 8,822 |  |  |
Restricted stock buy back | (54) |  | $ (54) |  |  |
Net income | 975 |  |  |  | 975 |
Ending balance (in shares) at Mar. 31, 2018 |  | 40,490,563 | 89,874 |  |  |
Ending balance at Mar. 31, 2018 | 191,623 | $ 40 | $ (720) | 159,739 | 32,564 | 0
Beginning balance (in shares) at Dec. 31, 2018 |  | 39,974,478 | 699,035 |  |  |
Beginning balance at Dec. 31, 2018 | 209,360 | $ 40 | $ (2,839) | 162,195 | 50,277 | (313)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Foreign currency translation adjustment | 145 |  |  |  |  | 145
Vesting of restricted stock (in shares) |  | 30,729 |  |  |  |
Stock-based compensation | 790 |  |  | 790 |  |
Adjustments to Additional Paid in Capital, Share-based Compensation, Employee Stock Purchase Program, Requisite Service Period Recognition | 9 |  |  | 9 |  |
Employee stock purchase plan issuance (in shares) |  | 20,954 |  |  |  |
Employee stock purchase plan issuance | 40 |  |  | 40 |  |
Restricted stock buy back (in shares) |  | (5,714) | 5,714 |  |  |
Restricted stock buy back | (23) |  | $ (23) |  |  |
Net income | 4,033 |  |  |  | 4,033 |
Ending balance (in shares) at Mar. 31, 2019 |  | 40,020,447 | 704,749 |  |  |
Ending balance at Mar. 31, 2019 | $ 214,354 | $ 40 | $ (2,862) | $ 163,034 | $ 54,310 | $ (168)

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