Stockholders' Equity - Additional Information (Details)				1 Months Ended	12 Months Ended
	Sep. 09, 2015 USD ($) shares	Jan. 09, 2015 USD ($) Executives shares	Jun. 11, 2013 shares	Aug. 31, 2007 USD ($) $ / shares shares	Jan. 02, 2016 USD ($) $ / shares shares	Jan. 03, 2015 USD ($) $ / shares shares	Dec. 28, 2013 USD ($) $ / shares shares	Dec. 31, 2011 USD ($)	Dec. 31, 2015 $ / shares	Aug. 31, 2015 USD ($)	Jul. 31, 2014 USD ($)	Feb. 28, 2013 USD ($)	Feb. 28, 2012 USD ($)
Undesignated Preferred stock authorized					2,000,000	2,000,000
Preferred stock Par value | $ / shares					$ 0.01	$ 0.01
Convertible preferred stock, shares issued					0	0
Warrants to purchase common stock				600,000
Exercise price of warrants | $ / shares				$ 0.01
Warrants expiration date				Dec. 31, 2007
Warrants to purchase number of common stock				1.2
Purchase price of preferred stock and warrants | $ / shares				$ 10.00
Proceeds allocated to common stock warrants | $				$ 2,300,000
Common stock converted from Series A Preferred Stock, shares			1,000,000
Exercisable period					3 years 6 months 22 days
Repurchase of shares					837,241
Shares reserved					1,322,274
Weighted-average grant date fair value of the options granted | $ / shares					$ 3.95	$ 4.02	$ 3.16
Total intrinsic value of options exercised | $					$ 1,500,000	$ 1,900,000	$ 1,500,000
Total unrecognized compensation cost related to non-vested share-based compensation arrangements | $					$ 1,800,000
Cost is expected to be recognized over a weighted average period					2 years 7 months 13 days
Excess tax benefits from stock-based awards | $					$ 0	$ 36,000	$ 0
Restricted stock units granted					227,905	62,225	234,012
Stock repurchase program authorized amount | $					$ 6,600,000						$ 3,000,000	$ 3,000,000	$ 4,000,000
Stock repurchase, shares					199,776
Shares repurchased price, per share | $ / shares					$ 7.82
Remaining common stock value authorized to purchase under stock repurchase program | $					$ 1,100,000
Stock repurchase program additional amount authorized | $										$ 2,000,000
Cash paid to former chief financial officer and chief operating officer to cancel agreement of vested stock option | $	$ 275,000
Number of shares, options canceled					174,870	27,957	123,679
James H. Mackaness
Number of shares, options canceled	92,656
Restricted Stock Units (RSUs)
Grant of non-qualified stock option | $								$ 20,000
The intrinsic value of the restricted stock units | $ / shares									$ 9.29
Restricted stock units granted					225,392	59,780	230,509
Number of Shares, Restricted stock units released					209,193	46,759	17,249
Restricted stock units released, intrinsic value | $					$ 2,500,000
Restricted stock units released, Shares withheld					66,882
Restricted stock units released, value withheld | $					$ 606,000
1998 Stock Plan
Voting rights on outstanding capital stock					10.00%
Exercise price of option					110.00%
Term of incentive stock options for major stock holders					5 years
Exercisable period					4 years
Maximum term of incentive stock options granted					10 years
Repurchase of shares					0	0
Expiration date of option Plan					2008-02
2008 Equity Incentive Plan
Grant of non-qualified stock option					300,000
Retention Award | Restricted Stock Units (RSUs)
Restricted stock units granted		56,000
Number of executives | Executives		6
Award investing period					4 years
Weighted grant date fair value of restricted stock units granted | $		$ 485,000
Retention Award | Restricted Stock Units (RSUs) | Vesting on Grant Date
Percentage of retention award vesting		20.00%
Retention Award | Restricted Stock Units (RSUs) | Vesting Annually
Percentage of retention award vesting					80.00%
Performance Award | Restricted Stock Units (RSUs)
Restricted stock units granted		110,000
Number of executives | Executives		6
Award investing period					4 years
Weighted grant date fair value of restricted stock units granted | $		$ 486,000
Period consider for calculation of average stock price performance after awards vesting					60 days
Market Performance Award | Restricted Stock Units (RSUs)
Restricted stock units granted		50,000
Award investing period					4 years
Weighted grant date fair value of restricted stock units granted | $		$ 234,000
Period consider for calculation of average stock price performance after awards vesting					60 days
Common Stock
Preferred stock conversion to common stock, share				1,000,000			1,000,000
Stock repurchase, shares					199,776	562,440	75,025
Series A Preferred Stock
Undesignated Preferred stock authorized				500,000
Preferred stock Par value | $ / shares				$ 0.01
Convertible preferred stock, shares issued				500,000
Unit preferred stock				1
Proceeds from common stock | $				$ 4,900,000