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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Accumulated Other Comprehensive Income (Loss) | Accumulated Deficit
--- | --- | --- | --- | --- | ---
Balance (in shares) at Dec. 31, 2014 |  | 32,774,374 |  |  |
Balance at Dec. 31, 2014 | $ 111,732 | $ 328 | $ 198,064 | $ (5,773) | $ (80,887)
Net income | 9,345 |  |  |  | 9,345
Unrealized gain on investments | 22 |  |  | 22 |
Foreign currency translation adjustment, net | (2,815) |  |  | (2,815) |
Share-based compensation expense | 3,598 |  | 3,598 |  |
Exercise of stock options and vesting of restricted stock | 866 | $ 1 | 865 |  |
Exercise of stock options and vesting of restricted stock (in shares) |  | 174,979 |  |  |
Balance (in shares) at Dec. 31, 2015 |  | 32,949,353 |  |  |
Balance at Dec. 31, 2015 | 122,748 | $ 329 | 202,527 | (8,566) | (71,542)
Net income | 11,681 |  |  |  | 11,681
Unrealized gain on investments | 6 |  |  | 6 |
Shares issued in acquisition (in shares) |  | 538,700 |  |  |
Shares issued in acquisition | 14,135 | $ 5 | 14,130 |  |
Payment of contingent consideration in stock | 875 |  | 875 |  |
Payment of contingent consideration in stock (in shares) |  | 34,803 |  |  |
Conversion option of convertible notes, net of issuance costs of $639,000 | 18,072 |  | 18,072 |  |
Foreign currency translation adjustment, net | (5,189) |  |  | (5,189) |
Share-based compensation expense | 4,595 |  | 4,595 |  |
Exercise of stock options and vesting of restricted stock | 1,841 | $ 4 | 1,837 |  |
Exercise of stock options and vesting of restricted stock (in shares) |  | 321,218 |  |  |
Balance (in shares) at Dec. 31, 2016 |  | 33,844,074 |  |  |
Balance at Dec. 31, 2016 | 168,764 | $ 338 | 242,036 | (13,749) | (59,861)
Net income | 28,353 |  |  |  | 28,353
Unrealized gain on investments | 5 |  |  | 5 |
Shares issued in acquisition (in shares) |  | 6,153,995 |  |  |
Shares issued in acquisition | 247,575 | $ 62 | 247,513 |  |
Payment of contingent consideration in stock | 1,063 | $ 1 | 1,062 |  |
Payment of contingent consideration in stock (in shares) |  | 30,756 |  |  |
Proceeds from issuance of common stock | 129,309 | $ 32 | 129,277 |  |
Proceeds from issuance of common stock (in shares) |  | 3,228,069 |  |  |
Foreign currency translation adjustment, net | 7,381 |  |  | 7,381 |
Share-based compensation expense | 6,747 |  | 6,747 |  |
Exercise of stock options and vesting of restricted stock | 2,351 | $ 3 | 2,348 |  |
Exercise of stock options and vesting of restricted stock (in shares) |  | 330,185 |  |  |
Balance (in shares) at Dec. 31, 2017 |  | 43,587,079 |  |  |
Balance at Dec. 31, 2017 | $ 591,548 | $ 436 | $ 628,983 | $ (6,363) | $ (31,508)

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