Stockholders' Equity - Stock Options Outstanding and Exercisable (Details) - $ / shares	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017
Stock options outstanding and exercisable
Options Outstanding, Weighted Average Exercise Price	$ 9.85	$ 10.47
Range One
Stock options outstanding and exercisable
Range of Exercise Prices, Lower Range Limit	3.49
Range of Exercise Prices, Upper Range Limit	$ 5.69
Options Outstanding, Number of Shares	99,341
Options Outstanding, Weighted Average Remaining Contractual Life (years)	4 years 9 months 7 days
Options Outstanding, Weighted Average Exercise Price	$ 5.03
Options Vested and Exercisable, Number of Shares Exercisable	37,966
Options Vested and Exercisable, Weighted Average Exercise Price	$ 4.37
Range Two
Stock options outstanding and exercisable
Range of Exercise Prices, Lower Range Limit	5.81
Range of Exercise Prices, Upper Range Limit	$ 6.00
Options Outstanding, Number of Shares	89,926
Options Outstanding, Weighted Average Remaining Contractual Life (years)	5 years 3 months 10 days
Options Outstanding, Weighted Average Exercise Price	$ 5.93
Options Vested and Exercisable, Number of Shares Exercisable	25,390
Options Vested and Exercisable, Weighted Average Exercise Price	$ 5.91
Range Three
Stock options outstanding and exercisable
Range of Exercise Prices, Lower Range Limit	6.30
Range of Exercise Prices, Upper Range Limit	$ 8.47
Options Outstanding, Number of Shares	85,912
Options Outstanding, Weighted Average Remaining Contractual Life (years)	3 years 10 months 6 days
Options Outstanding, Weighted Average Exercise Price	$ 7.24
Options Vested and Exercisable, Number of Shares Exercisable	50,582
Options Vested and Exercisable, Weighted Average Exercise Price	$ 7.23
Range Four
Stock options outstanding and exercisable
Range of Exercise Prices, Lower Range Limit	8.58
Range of Exercise Prices, Upper Range Limit	$ 9.05
Options Outstanding, Number of Shares	85,874
Options Outstanding, Weighted Average Remaining Contractual Life (years)	4 years 1 month 9 days
Options Outstanding, Weighted Average Exercise Price	$ 8.83
Options Vested and Exercisable, Number of Shares Exercisable	55,959
Options Vested and Exercisable, Weighted Average Exercise Price	$ 8.71
Range Five
Stock options outstanding and exercisable
Range of Exercise Prices, Lower Range Limit	9.34
Range of Exercise Prices, Upper Range Limit	$ 9.40
Options Outstanding, Number of Shares	11,875
Options Outstanding, Weighted Average Remaining Contractual Life (years)	1 year 4 months 24 days
Options Outstanding, Weighted Average Exercise Price	$ 9.36
Options Vested and Exercisable, Number of Shares Exercisable	11,875
Options Vested and Exercisable, Weighted Average Exercise Price	$ 9.36
Range Six
Stock options outstanding and exercisable
Range of Exercise Prices, Lower Range Limit	9.54
Range of Exercise Prices, Upper Range Limit	$ 9.54
Options Outstanding, Number of Shares	324,854
Options Outstanding, Weighted Average Remaining Contractual Life (years)	5 years 29 days
Options Outstanding, Weighted Average Exercise Price	$ 9.54
Options Vested and Exercisable, Number of Shares Exercisable	135,188
Options Vested and Exercisable, Weighted Average Exercise Price	$ 9.54
Range Seven
Stock options outstanding and exercisable
Range of Exercise Prices, Lower Range Limit	10.14
Range of Exercise Prices, Upper Range Limit	$ 11.16
Options Outstanding, Number of Shares	83,853
Options Outstanding, Weighted Average Remaining Contractual Life (years)	3 years 9 months 21 days
Options Outstanding, Weighted Average Exercise Price	$ 10.80
Options Vested and Exercisable, Number of Shares Exercisable	65,004
Options Vested and Exercisable, Weighted Average Exercise Price	$ 10.75
Range Eight
Stock options outstanding and exercisable
Range of Exercise Prices, Lower Range Limit	12.85
Range of Exercise Prices, Upper Range Limit	$ 12.85
Options Outstanding, Number of Shares	15,394
Options Outstanding, Weighted Average Remaining Contractual Life (years)	4 years 8 months 12 days
Options Outstanding, Weighted Average Exercise Price	$ 12.85
Options Vested and Exercisable, Number of Shares Exercisable	8,520
Options Vested and Exercisable, Weighted Average Exercise Price	$ 12.85
Range Nine
Stock options outstanding and exercisable
Range of Exercise Prices, Lower Range Limit	14.61
Range of Exercise Prices, Upper Range Limit	$ 14.61
Options Outstanding, Number of Shares	25,000
Options Outstanding, Weighted Average Remaining Contractual Life (years)	5 years 2 months 8 days
Options Outstanding, Weighted Average Exercise Price	$ 14.61
Options Vested and Exercisable, Number of Shares Exercisable	10,939
Options Vested and Exercisable, Weighted Average Exercise Price	$ 14.61
Range Ten
Stock options outstanding and exercisable
Range of Exercise Prices, Lower Range Limit	16.29
Range of Exercise Prices, Upper Range Limit	$ 16.29
Options Outstanding, Number of Shares	22,869
Options Outstanding, Weighted Average Remaining Contractual Life (years)	3 years 2 months 4 days
Options Outstanding, Weighted Average Exercise Price	$ 16.29
Options Vested and Exercisable, Number of Shares Exercisable	16,893
Options Vested and Exercisable, Weighted Average Exercise Price	$ 16.29
Range Eleven
Stock options outstanding and exercisable
Range of Exercise Prices, Lower Range Limit	3.49
Range of Exercise Prices, Upper Range Limit	$ 16.29
Options Outstanding, Number of Shares	844,898
Options Outstanding, Weighted Average Remaining Contractual Life (years)	4 years 7 months 9 days
Options Outstanding, Weighted Average Exercise Price	$ 8.84
Options Vested and Exercisable, Number of Shares Exercisable	418,316
Options Vested and Exercisable, Weighted Average Exercise Price	$ 9.12