Summary of Significant Accounting Policies - Property, Equipment and Capitalized Software Costs - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2016	Oct. 02, 2015	Jul. 03, 2015	Sep. 30, 2016	Oct. 02, 2015	Dec. 31, 2015
Property Plant And Equipment [Line Items]
Capitalized computer software, additions	$ 100	$ 100		$ 400	$ 600
Capitalized software developed for internal use	23,703			23,703		$ 24,070
Depreciation and amortization expense				1,267	1,532
Capitalized software costs, accumulated amortization	1,900	1,700		1,900	1,700
Written-off to direct cost			$ 1,100
Capitalized Software [Member]
Property Plant And Equipment [Line Items]
Capitalized software developed for internal use	2,500	2,200		2,500	2,200
Depreciation and amortization expense	$ 100			$ 100	$ 300
Capitalized Software [Member] | Minimum [Member]
Property Plant And Equipment [Line Items]
Property, equipment and capitalized software, useful life				3 years
Capitalized Software [Member] | Maximum [Member]
Property Plant And Equipment [Line Items]
Depreciation and amortization expense		$ 100
Property, equipment and capitalized software, useful life				5 years