Stockholders' Equity - Stock Options Outstanding and Exercisable (Details) - $ / shares	12 Months Ended
	Jan. 01, 2022	Jan. 02, 2021
Stock options outstanding and exercisable
Options Outstanding, Weighted Average Exercise Price	$ 5.14	$ 7.23
Range One
Stock options outstanding and exercisable
Range of Exercise Prices, Lower Range Limit	1.82
Range of Exercise Prices, Upper Range Limit	$ 2.12
Options Outstanding, Number of Shares	12,613
Options Outstanding, Weighted Average Remaining Contractual Life (years)	4 years 10 months 6 days
Options Outstanding, Weighted Average Exercise Price	$ 2.00
Options Vested and Exercisable, Number of Shares Exercisable	5,146
Options Vested and Exercisable, Weighted Average Exercise Price	$ 2.04
Range Two
Stock options outstanding and exercisable
Range of Exercise Prices, Lower Range Limit	2.13
Range of Exercise Prices, Upper Range Limit	$ 2.13
Options Outstanding, Number of Shares	360,473
Options Outstanding, Weighted Average Remaining Contractual Life (years)	5 years 8 months 1 day
Options Outstanding, Weighted Average Exercise Price	$ 2.13
Options Vested and Exercisable, Number of Shares Exercisable	103,164
Options Vested and Exercisable, Weighted Average Exercise Price	$ 2.13
Range Three
Stock options outstanding and exercisable
Range of Exercise Prices, Lower Range Limit	2.18
Range of Exercise Prices, Upper Range Limit	$ 4.85
Options Outstanding, Number of Shares	164,315
Options Outstanding, Weighted Average Remaining Contractual Life (years)	4 years 6 months 10 days
Options Outstanding, Weighted Average Exercise Price	$ 2.99
Options Vested and Exercisable, Number of Shares Exercisable	89,575
Options Vested and Exercisable, Weighted Average Exercise Price	$ 3.09
Range Four
Stock options outstanding and exercisable
Range of Exercise Prices, Lower Range Limit	4.92
Range of Exercise Prices, Upper Range Limit	$ 4.92
Options Outstanding, Number of Shares	600,000
Options Outstanding, Weighted Average Remaining Contractual Life (years)	6 years 4 months 17 days
Options Outstanding, Weighted Average Exercise Price	$ 4.92
Options Vested and Exercisable, Number of Shares Exercisable	229,167
Options Vested and Exercisable, Weighted Average Exercise Price	$ 4.92
Range Five
Stock options outstanding and exercisable
Range of Exercise Prices, Lower Range Limit	4.98
Range of Exercise Prices, Upper Range Limit	$ 6.57
Options Outstanding, Number of Shares	183,354
Options Outstanding, Weighted Average Remaining Contractual Life (years)	4 years 6 months 14 days
Options Outstanding, Weighted Average Exercise Price	$ 5.75
Options Vested and Exercisable, Number of Shares Exercisable	106,659
Options Vested and Exercisable, Weighted Average Exercise Price	$ 5.54
Range Six
Stock options outstanding and exercisable
Range of Exercise Prices, Lower Range Limit	6.58
Range of Exercise Prices, Upper Range Limit	$ 6.58
Options Outstanding, Number of Shares	242,263
Options Outstanding, Weighted Average Remaining Contractual Life (years)	6 years 7 months 2 days
Options Outstanding, Weighted Average Exercise Price	$ 6.58
Range Seven
Stock options outstanding and exercisable
Range of Exercise Prices, Lower Range Limit	6.76
Range of Exercise Prices, Upper Range Limit	$ 11.16
Options Outstanding, Number of Shares	174,141
Options Outstanding, Weighted Average Remaining Contractual Life (years)	2 years 9 months 18 days
Options Outstanding, Weighted Average Exercise Price	$ 9.25
Options Vested and Exercisable, Number of Shares Exercisable	124,121
Options Vested and Exercisable, Weighted Average Exercise Price	$ 9.88
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	15,000
Options Outstanding, Weighted Average Remaining Contractual Life (years)	1 year 9 months 25 days
Options Outstanding, Weighted Average Exercise Price	$ 12.85
Options Vested and Exercisable, Number of Shares Exercisable	15,000
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	20,000
Options Outstanding, Weighted Average Remaining Contractual Life (years)	2 years 2 months 4 days
Options Outstanding, Weighted Average Exercise Price	$ 14.61
Options Vested and Exercisable, Number of Shares Exercisable	20,000
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	462
Options Outstanding, Weighted Average Remaining Contractual Life (years)	1 year 6 months 25 days
Options Outstanding, Weighted Average Exercise Price	$ 16.29
Options Vested and Exercisable, Number of Shares Exercisable	462
Options Vested and Exercisable, Weighted Average Exercise Price	$ 16.29
Range Eleven
Stock options outstanding and exercisable
Range of Exercise Prices, Lower Range Limit	1.82
Range of Exercise Prices, Upper Range Limit	$ 16.29
Options Outstanding, Number of Shares	1,772,621
Options Outstanding, Weighted Average Remaining Contractual Life (years)	5 years 5 months 12 days
Options Outstanding, Weighted Average Exercise Price	$ 5.07
Options Vested and Exercisable, Number of Shares Exercisable	693,294
Options Vested and Exercisable, Weighted Average Exercise Price	$ 5.69