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Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-In Capital | Retained Earnings / (Accumulated Deficit) | Accumulated Other Comprehensive Income
--- | --- | --- | --- | --- | ---
Beginning Balance Value at Dec. 26, 2015 | $ 187,328 | $ 24 | $ 258,715 | $ (66,209) | $ (5,202)
Beginning 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 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income | 30,202 |  |  | 30,202 |
Adjustment due to adoption of ASU | 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 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income | $ 57,648 |  |  | 57,648 |
Adjustment due to adoption of ASU | Accounting Standards Update 2014-09 [Member] | 725 |  |  | 725 |
Employee benefit plan adjustment | (259) |  |  |  | (259)
Foreign currency translation adjustments | (482) |  |  |  | (482)
Unrealized gain (loss) on investments, net of tax | 308 |  |  |  | 308
Restructuring of foreign subsidiaries | (84) |  |  | (84) |
Issuance of common stock under stock-based compensation plans | 218 |  | 218 |  |
Issuance of common stock under stock-based compensation plans, Shares |  | 514,541 |  |  |
Stock-based compensation expense | 11,382 |  | 11,382 |  |
Stock issued to acquire 4D Technology | 4,000 |  | 4,000 |  |
Stock issued to acquire 4D Technology, Shares |  | 125,117 |  |  |
Repurchases and retirement of common stock under share repurchase plans | $ (22,987) | $ (2) | (22,985) |  |
Repurchases and retirement of common stock under share repurchase plans, Shares | (896,187) | (896,187) |  |  |
Ending Balance Value at Dec. 29, 2018 | $ 312,852 | $ 24 | $ 247,983 | $ 67,402 | $ (2,557)
Ending Balance Shares at Dec. 29, 2018 | 24,372,193 | 24,372,193 |  |  |

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