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Quarterly Financial Data (unaudited) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 24, 2016
Jun. 25, 2016
Mar. 26, 2016
Dec. 26, 2015
Sep. 26, 2015
Jun. 27, 2015
Mar. 28, 2015
Dec. 31, 2016
Dec. 26, 2015
Dec. 27, 2014
Quarterly Financial Information Disclosure [Abstract]                      
Total revenue $ 24,752 $ 21,810 $ 22,723 $ 22,074 $ 20,577 $ 19,134 $ 19,232 $ 19,026 $ 91,359 $ 77,969 $ 67,449
Operating income 8,255 6,080 7,240 7,628 6,508 5,853 2,406 4,951 29,203 19,718 18,066
Net income $ 4,312 $ 2,753 $ 4,079 $ 4,290 $ 3,795 $ 3,173 $ 584 $ 2,554 $ 15,434 $ 10,106 $ 8,986
Earnings per share                      
Basic (in usd per share) $ 0.15 $ 0.10 $ 0.14 $ 0.15 $ 0.13 $ 0.11 $ 0.02 $ 0.10 $ 0.54 $ 0.37 $ 0.35
Diluted (in usd per share) $ 0.15 $ 0.09 $ 0.14 $ 0.15 $ 0.13 $ 0.11 $ 0.02 $ 0.10 $ 0.53 $ 0.36 $ 0.34
Weighted average shares outstanding                      
Basic (in shares) 28,745 28,725 28,646 28,586 28,581 28,581 26,689 26,290 28,637 27,497 25,846
Diluted weighted average number of common shares (in shares) 29,114 29,014 28,989 28,967 28,951 28,891 26,970 26,607 28,983 27,816 26,204