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Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands | Total | Common Stock and Additional Paid-In Capital | Accumulated Other Comprehensive Income (Loss) | Accumulated Deficit | Treasury Stock
--- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2014 |  | $ 76,603 | $ 204,876 | $ 102 | $ (82,806) | $ (45,569)
Beginning balance, shares at Dec. 31, 2014 |  |  | 34,225,778 |  |  | 6,510,391
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income (loss) |  | 2,858 |  |  | 2,858 |
Unrealized gain (loss) on available-for-sale securities, net of taxes |  | (16) |  | (16) |  |
Foreign currency translation adjustments |  | $ 0 |  |  |  |
Repurchase of stock, shares |  | 0 |  |  |  |
Issuance of stock for ESPP purchase |  | $ 367 | $ 367 |  |  |
Issuance of stock for ESPP purchase, shares |  |  | 45,820 |  |  |
Exercise of stock options, net of shares withheld for employee taxes |  | 1,561 | $ 1,630 |  |  | $ (69)
Exercise of stock options, net of shares withheld for employee taxes, shares |  |  | 239,071 |  |  | 5,503
Release of restricted stock units and awards, including related stock compensation |  | 3,059 | $ 3,059 |  |  |
Release of restricted stock units and awards, shares |  |  | 334,641 |  |  |
Tax benefit/(deficiency) from the stock incentive plans |  | (228) | $ (228) |  |  |
Stock based compensation for stock options |  | 2,411 | 2,411 |  |  |
Ending balance at Dec. 31, 2015 |  | 86,615 | $ 212,115 | 86 | (79,948) | $ (45,638)
Ending balance, shares at Dec. 31, 2015 |  |  | 34,845,310 |  |  | 6,515,894
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income (loss) |  | (39,381) |  |  | (39,381) |
Unrealized gain (loss) on available-for-sale securities, net of taxes |  | 8 |  | 8 |  |
Foreign currency translation adjustments |  | 21 |  | 21 |  |
Repurchase of stock |  | (729) |  |  |  | $ (729)
Repurchase of stock, shares |  |  |  |  |  | 105,750
Issuance of stock for ESPP purchase |  | 307 | $ 307 |  |  |
Issuance of stock for ESPP purchase, shares |  |  | 45,825 |  |  |
Exercise of stock options, net of shares withheld for employee taxes |  | 2,388 | $ 2,565 |  |  | $ (177)
Exercise of stock options, net of shares withheld for employee taxes, shares |  |  | 395,515 |  |  | 16,359
Release of restricted stock units and awards, including related stock compensation |  | 2,257 | $ 2,257 |  |  |
Release of restricted stock units and awards, shares |  |  | 268,912 |  |  |
Stock based compensation for stock options |  | 3,854 | $ 3,854 |  |  |
Ending balance at Dec. 31, 2016 |  | 55,340 | $ 221,098 | 115 | (119,329) | $ (46,544)
Ending balance, shares at Dec. 31, 2016 |  |  | 35,555,562 |  |  | 6,638,003
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income (loss) |  | (45,291) |  |  | (45,291) |
Unrealized gain (loss) on available-for-sale securities, net of taxes |  | (16) |  | (16) |  |
Foreign currency translation adjustments |  | 0 |  |  |  |
Repurchase of stock |  | $ (328) |  |  |  | $ (328)
Repurchase of stock, shares |  | 48,687 |  |  |  | 48,687
Issuance of stock for ESPP purchase |  | $ 328 | $ 328 |  |  |
Issuance of stock for ESPP purchase, shares |  |  | 48,750 |  |  |
Exercise of stock options, net of shares withheld for employee taxes |  | 518 | $ 518 |  |  | $ 0
Exercise of stock options, net of shares withheld for employee taxes, shares |  |  | 70,608 |  |  | 0
Release of restricted stock units and awards, including related stock compensation |  | 2,661 | $ 2,661 |  |  |
Release of restricted stock units and awards, shares |  |  | 275,598 |  |  |
Stock based compensation for stock options |  | 3,441 | $ 3,441 |  |  |
Effect of change in accounting policy (1) | [1] | (6,996) |  |  | (6,996) |
Ending balance at Dec. 31, 2017 |  | $ 9,657 | $ 228,046 | $ 99 | $ (171,616) | $ (46,872)
Ending balance, shares at Dec. 31, 2017 |  |  | 35,950,518 |  |  | 6,686,690
[1] | Represents less than 10% of the Company’s outstanding accounts and other receivables.

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