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Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands | Total | Common Stock [Member] | Additional Paid-in Capital [Member] | Accumulated Other Comprehensive Loss [Member] | Accumulated Deficit [Member]
--- | --- | --- | --- | --- | ---
Balances at Dec. 28, 2014 | $ 107,616 | $ 134 | $ 205,749 | $ (22) | $ (98,245)
Balances (in shares) at Dec. 28, 2014 |  | 13,389,000 |  |  |
Proceeds from issuance of stock on options exercised | 168 |  | 168 |  |
Proceeds from issuance of stock on options exercised (in shares) |  | 25,000 |  |  |
Effect of share-based compensation | 809 |  | 809 |  |
Other comprehensive income | 22 |  |  | $ 22 |
Share issuance related to business combination | 77,350 | $ 85 | 77,265 |  |
Share issuance related to business combination (in shares) |  | 8,454,000 |  |  |
Net income | 24,520 |  |  |  | 24,520
Balances at Dec. 31, 2015 | 210,485 | $ 219 | 283,991 |  | (73,725)
Balances (in shares) at Dec. 31, 2015 |  | 21,868,000 |  |  |
Proceeds from issuance of stock on options exercised | 1,792 | $ 3 | 1,789 |  |
Proceeds from issuance of stock on options exercised (in shares) |  | 314,000 |  |  |
Effect of share-based compensation | 3,878 |  | 3,878 |  |
Share issuance related to business combination | 500 | $ 1 | 499 |  |
Share issuance related to business combination (in shares) |  | 50,000 |  |  |
Special dividend ($1.71 per share) | (23,529) |  |  |  | (23,529)
Net income | 16,300 |  |  |  | 16,300
Balances at Dec. 31, 2016 | 209,426 | $ 223 | 290,157 |  | (80,954)
Balances (in shares) at Dec. 31, 2016 |  | 22,232,000 |  |  |
Proceeds from issuance of stock on options exercised | $ 169 | $ 1 | 168 |  |
Proceeds from issuance of stock on options exercised (in shares) | 22,989 | 135,000 |  |  |
Effect of share-based compensation | $ 8,754 |  | 8,754 |  |
Tax benefit from share-based compensation | (1,015) |  | (1,015) |  |
Share issuance related to business combination | 101,486 | $ 40 | 101,446 |  |
Share issuance related to business combination (in shares) |  | 4,046,000 |  |  |
Net income | 2,171 |  |  |  | 2,171
Balances at Dec. 31, 2017 | $ 320,991 | $ 264 | $ 399,510 |  | $ (78,783)
Balances (in shares) at Dec. 31, 2017 |  | 26,413,000 |  |  |

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