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Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-In Capital | Accumulated Deficit | Accumulated Other Comprehensive Income
--- | --- | --- | --- | --- | ---
Beginning Balance Value at Dec. 27, 2014 | $ 179,537 | $ 24 | $ 251,396 | $ (69,114) | $ (2,769)
Beginning Balance Shares at Dec. 27, 2014 |  | 23,813,729 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income | 2,905 |  |  | 2,905 |
Employee benefit plan adjustment | (76) |  |  |  | (76)
Foreign currency translation adjustments | (2,344) |  |  |  | (2,344)
Unrealized gain (loss) on investments, net of tax | (13) |  |  |  | (13)
Issuance of common stock under stock-based compensation plans | 2,792 |  | 2,792 |  |
Issuance of common stock under stock-based compensation plans, Shares |  | 521,607 |  |  |
Stock-based compensation expense | 6,248 |  | 6,248 |  |
Repurchases and retirement of common stock under share repurchase plans | $ (1,721) |  | (1,721) |  |
Repurchases and retirement of common stock under share repurchase plans, Shares | (111,050) | (111,050) |  |  |
Ending Balance Value at Dec. 26, 2015 | $ 187,328 | $ 24 | 258,715 | (66,209) | (5,202)
Ending Balance Shares at Dec. 26, 2015 |  | 24,224,286 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income | 44,035 |  |  | 44,035 |
Employee benefit plan adjustment | (17) |  |  |  | (17)
Foreign currency translation adjustments | (869) |  |  |  | (869)
Unrealized gain (loss) on investments, net of tax | 42 |  |  |  | 42
Issuance of common stock under stock-based compensation plans | 6,625 | $ 1 | 6,624 |  |
Issuance of common stock under stock-based compensation plans, Shares |  | 846,603 |  |  |
Stock-based compensation expense | 7,666 |  | 7,666 |  |
Excess tax benefit related to stock options | (1,036) |  | (1,036) |  |
Ending Balance Value at Dec. 31, 2016 | $ 243,774 | $ 25 | 271,969 | (22,174) | (6,046)
Ending Balance Shares at Dec. 31, 2016 | 25,070,889 | 25,070,889 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income | $ 30,202 |  |  | 30,202 |
Adjustment due to adoption of ASU 2016-09 Improvements to Employee Share-Based Payment Accounting | Accounting Standards Update 2016-09 [Member] | 1,224 |  | 139 | 1,085 |
Employee benefit plan adjustment | (160) |  |  |  | (160)
Foreign currency translation adjustments | 4,170 |  |  |  | 4,170
Unrealized gain (loss) on investments, net of tax | (88) |  |  |  | (88)
Issuance of common stock under stock-based compensation plans | 1,441 | $ 1 | 1,440 |  |
Issuance of common stock under stock-based compensation plans, Shares |  | 623,681 |  |  |
Stock-based compensation expense | 8,819 |  | 8,819 |  |
Repurchases and retirement of common stock under share repurchase plans | $ (26,999) |  | (26,999) |  |
Repurchases and retirement of common stock under share repurchase plans, Shares | (1,065,848) | (1,065,848) |  |  |
Ending Balance Value at Dec. 30, 2017 | $ 262,383 | $ 26 | $ 255,368 | $ 9,113 | $ (2,124)
Ending Balance Shares at Dec. 30, 2017 | 24,628,722 | 24,628,722 |  |  |

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