Stockholders' Equity - Stock Options Outstanding and Exercisable (Details)	12 Months Ended
	Dec. 30, 2017 $ / shares shares
Range One
Stock options outstanding and exercisable
Range of Exercise Prices, Lower Range Limit	$ 3.46
Range of Exercise Prices, Upper Range Limit	$ 6.30
Options Outstanding, Number of Shares | shares	97,542
Options Outstanding, Weighted Average Remaining Contractual Life (years)	2 years 1 month 9 days
Options Outstanding, Weighted Average Exercise Price	$ 4.94
Options Vested and Exercisable, Number of Shares Exercisable | shares	97,542
Options Vested and Exercisable, Weighted Average Exercise Price	$ 4.94
Range Two
Stock options outstanding and exercisable
Range of Exercise Prices, Lower Range Limit	6.83
Range of Exercise Prices, Upper Range Limit	$ 8.58
Options Outstanding, Number of Shares | shares	96,655
Options Outstanding, Weighted Average Remaining Contractual Life (years)	4 years 1 month 17 days
Options Outstanding, Weighted Average Exercise Price	$ 7.93
Options Vested and Exercisable, Number of Shares Exercisable | shares	61,551
Options Vested and Exercisable, Weighted Average Exercise Price	$ 8.06
Range Three
Stock options outstanding and exercisable
Range of Exercise Prices, Lower Range Limit	8.60
Range of Exercise Prices, Upper Range Limit	$ 9.40
Options Outstanding, Number of Shares | shares	84,000
Options Outstanding, Weighted Average Remaining Contractual Life (years)	5 years 9 months 25 days
Options Outstanding, Weighted Average Exercise Price	$ 9.06
Options Vested and Exercisable, Number of Shares Exercisable | shares	25,202
Options Vested and Exercisable, Weighted Average Exercise Price	$ 8.87
Range Four
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 | shares	385,000
Options Outstanding, Weighted Average Remaining Contractual Life (years)	6 years 6 months 21 days
Options Outstanding, Weighted Average Exercise Price	$ 9.54
Options Vested and Exercisable, Number of Shares Exercisable | shares	32,709
Options Vested and Exercisable, Weighted Average Exercise Price	$ 9.54
Range Five
Stock options outstanding and exercisable
Range of Exercise Prices, Lower Range Limit	10.14
Range of Exercise Prices, Upper Range Limit	$ 10.73
Options Outstanding, Number of Shares | shares	69,374
Options Outstanding, Weighted Average Remaining Contractual Life (years)	4 years 3 months
Options Outstanding, Weighted Average Exercise Price	$ 10.62
Options Vested and Exercisable, Number of Shares Exercisable | shares	45,774
Options Vested and Exercisable, Weighted Average Exercise Price	$ 10.63
Range Six
Stock options outstanding and exercisable
Range of Exercise Prices, Lower Range Limit	11.04
Range of Exercise Prices, Upper Range Limit	$ 11.04
Options Outstanding, Number of Shares | shares	5,300
Options Outstanding, Weighted Average Remaining Contractual Life (years)	5 years 3 months 25 days
Options Outstanding, Weighted Average Exercise Price	$ 11.04
Options Vested and Exercisable, Number of Shares Exercisable | shares	2,209
Options Vested and Exercisable, Weighted Average Exercise Price	$ 11.04
Range Seven
Stock options outstanding and exercisable
Range of Exercise Prices, Lower Range Limit	11.16
Range of Exercise Prices, Upper Range Limit	$ 11.16
Options Outstanding, Number of Shares | shares	24,900
Options Outstanding, Weighted Average Remaining Contractual Life (years)	6 years 3 months 25 days
Options Outstanding, Weighted Average Exercise Price	$ 11.16
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 | shares	27,500
Options Outstanding, Weighted Average Remaining Contractual Life (years)	3 years 7 months 28 days
Options Outstanding, Weighted Average Exercise Price	$ 12.85
Options Vested and Exercisable, Number of Shares Exercisable | shares	8,235
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 | shares	38,000
Options Outstanding, Weighted Average Remaining Contractual Life (years)	5 years 4 months 28 days
Options Outstanding, Weighted Average Exercise Price	$ 14.61
Options Vested and Exercisable, Number of Shares Exercisable | shares	5,940
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 | shares	29,040
Options Outstanding, Weighted Average Remaining Contractual Life (years)	5 years 6 months 7 days
Options Outstanding, Weighted Average Exercise Price	$ 16.29
Options Vested and Exercisable, Number of Shares Exercisable | shares	10,674
Options Vested and Exercisable, Weighted Average Exercise Price	$ 16.29
Range Eleven
Stock options outstanding and exercisable
Range of Exercise Prices, Lower Range Limit	3.46
Range of Exercise Prices, Upper Range Limit	$ 16.29
Options Outstanding, Number of Shares | shares	857,311
Options Outstanding, Weighted Average Remaining Contractual Life (years)	5 years 3 months 29 days
Options Outstanding, Weighted Average Exercise Price	$ 9.49
Options Vested and Exercisable, Number of Shares Exercisable | shares	289,836
Options Vested and Exercisable, Weighted Average Exercise Price	$ 8.25