Stockholders' Equity - Stock Options Outstanding and Exercisable (Details)	12 Months Ended
	Jan. 02, 2016 $ / shares shares
Range One
Stock options outstanding and exercisable
Range of Exercise Prices, Lower Range Limit	$ 2.27
Range of Exercise Prices, Upper Range Limit	$ 3.86
Options Outstanding, Number of Shares | shares	84,585
Options Outstanding, Weighted Average Remaining Contractual Life (years)	2 years 8 months 1 day
Options Outstanding, Weighted Average Exercise Price	$ 3.45
Options Vested and Exercisable, Number of Shares Exercisable | shares	63,856
Options Vested and Exercisable, Weighted Average Exercise Price	$ 3.32
Range Two
Stock options outstanding and exercisable
Range of Exercise Prices, Lower Range Limit	3.89
Range of Exercise Prices, Upper Range Limit	$ 4.31
Options Outstanding, Number of Shares | shares	70,533
Options Outstanding, Weighted Average Remaining Contractual Life (years)	2 years 2 months 5 days
Options Outstanding, Weighted Average Exercise Price	$ 4.11
Options Vested and Exercisable, Number of Shares Exercisable | shares	63,133
Options Vested and Exercisable, Weighted Average Exercise Price	$ 4.13
Range Three
Stock options outstanding and exercisable
Range of Exercise Prices, Lower Range Limit	4.74
Range of Exercise Prices, Upper Range Limit	$ 5.92
Options Outstanding, Number of Shares | shares	78,265
Options Outstanding, Weighted Average Remaining Contractual Life (years)	4 years 6 months 11 days
Options Outstanding, Weighted Average Exercise Price	$ 5.47
Options Vested and Exercisable, Number of Shares Exercisable | shares	40,774
Options Vested and Exercisable, Weighted Average Exercise Price	$ 5.42
Range Four
Stock options outstanding and exercisable
Range of Exercise Prices, Lower Range Limit	6.00
Range of Exercise Prices, Upper Range Limit	$ 8.16
Options Outstanding, Number of Shares | shares	104,637
Options Outstanding, Weighted Average Remaining Contractual Life (years)	6 years 3 months
Options Outstanding, Weighted Average Exercise Price	$ 7.50
Options Vested and Exercisable, Number of Shares Exercisable | shares	14,896
Options Vested and Exercisable, Weighted Average Exercise Price	$ 6.68
Range Five
Stock options outstanding and exercisable
Range of Exercise Prices, Lower Range Limit	8.29
Range of Exercise Prices, Upper Range Limit	$ 8.58
Options Outstanding, Number of Shares | shares	73,925
Options Outstanding, Weighted Average Remaining Contractual Life (years)	5 years 1 month 24 days
Options Outstanding, Weighted Average Exercise Price	$ 8.46
Options Vested and Exercisable, Number of Shares Exercisable | shares	32,751
Options Vested and Exercisable, Weighted Average Exercise Price	$ 8.46
Range Six
Stock options outstanding and exercisable
Range of Exercise Prices, Lower Range Limit	8.60
Range of Exercise Prices, Upper Range Limit	$ 9.34
Options Outstanding, Number of Shares | shares	51,813
Options Outstanding, Weighted Average Remaining Contractual Life (years)	5 years 3 months 26 days
Options Outstanding, Weighted Average Exercise Price	$ 9.01
Options Vested and Exercisable, Number of Shares Exercisable | shares	21,584
Options Vested and Exercisable, Weighted Average Exercise Price	$ 9.04
Range Seven
Stock options outstanding and exercisable
Range of Exercise Prices, Lower Range Limit	10.14
Range of Exercise Prices, Upper Range Limit	$ 10.14
Options Outstanding, Number of Shares | shares	17,400
Options Outstanding, Weighted Average Remaining Contractual Life (years)	6 years 3 months 26 days
Options Outstanding, Weighted Average Exercise Price	$ 10.14
Range Eight
Stock options outstanding and exercisable
Range of Exercise Prices, Lower Range Limit	10.19
Range of Exercise Prices, Upper Range Limit	$ 10.19
Options Outstanding, Number of Shares | shares	3,000
Options Outstanding, Weighted Average Remaining Contractual Life (years)	4 years 11 months 1 day
Options Outstanding, Weighted Average Exercise Price	$ 10.19
Options Vested and Exercisable, Number of Shares Exercisable | shares	1,563
Options Vested and Exercisable, Weighted Average Exercise Price	$ 10.19
Range Nine
Stock options outstanding and exercisable
Range of Exercise Prices, Lower Range Limit	10.45
Range of Exercise Prices, Upper Range Limit	$ 10.45
Options Outstanding, Number of Shares | shares	800
Options Outstanding, Weighted Average Remaining Contractual Life (years)	6 years 1 month 28 days
Options Outstanding, Weighted Average Exercise Price	$ 10.45
Options Vested and Exercisable, Number of Shares Exercisable | shares	100
Options Vested and Exercisable, Weighted Average Exercise Price	$ 10.45
Range Ten
Stock options outstanding and exercisable
Range of Exercise Prices, Lower Range Limit	10.73
Range of Exercise Prices, Upper Range Limit	$ 10.73
Options Outstanding, Number of Shares | shares	66,534
Options Outstanding, Weighted Average Remaining Contractual Life (years)	6 years 26 days
Options Outstanding, Weighted Average Exercise Price	$ 10.73
Options Vested and Exercisable, Number of Shares Exercisable | shares	14,552
Options Vested and Exercisable, Weighted Average Exercise Price	$ 10.73
Range Eleven
Stock options outstanding and exercisable
Range of Exercise Prices, Lower Range Limit	2.27
Range of Exercise Prices, Upper Range Limit	$ 10.73
Options Outstanding, Number of Shares | shares	551,492
Options Outstanding, Weighted Average Remaining Contractual Life (years)	4 years 8 months 5 days
Options Outstanding, Weighted Average Exercise Price	$ 6.92
Options Vested and Exercisable, Number of Shares Exercisable | shares	253,209
Options Vested and Exercisable, Weighted Average Exercise Price	$ 5.68