Quarterly Financial Data (Unaudited) - Schedule of Quarterly Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jul. 01, 2016	Apr. 01, 2016	Dec. 31, 2015	Oct. 02, 2015	Jul. 03, 2015	Apr. 03, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Quarterly Financial Data [Abstract]
Revenue	$ 77,492	$ 78,065	$ 83,486	$ 85,850	$ 84,202	$ 93,055	$ 94,744	$ 97,477	$ 324,893	$ 369,478	$ 393,268
Direct costs	62,639	64,193	67,574	71,305	67,416	75,587	79,143	80,172	265,711	302,318	313,930
Gross profit	14,853	13,872	15,912	14,545	16,786	17,468	15,601	17,305	59,182	67,160
Selling, general, and administrative expenses	13,140	14,567	14,026	13,467	13,045	13,901	14,485	15,092	55,200	56,523	62,186
Goodwill impairment charges		15,785		21,544					37,329
Operating income (loss)	1,713	(16,480)	1,886	(20,466)	3,741	3,567	1,116	2,213	(33,347)	10,637	17,152
Interest and other income (expense), net	(107)	77	(97)	(62)	168	(24)	(42)	(10)	(189)	92
Income (loss) before income taxes	1,606	(16,403)	1,789	(20,528)	3,909	3,543	1,074	2,203	(33,536)	10,729	16,938
Provision for income taxes	463	(220)	530	329	1,291	1,472	520	936	1,102	4,219	6,588
Net income (loss)	$ 1,143	$ (16,183)	$ 1,259	$ (20,857)	$ 2,618	$ 2,071	$ 554	$ 1,267	$ (34,638)	$ 6,510	$ 10,350
Basic (in dollars per share)	$ 0.07	$ (1.03)	$ 0.08	$ (1.34)	$ 0.17	$ 0.13	$ 0.04	$ 0.08	$ (2.22)	$ 0.42	$ 0.68
Diluted (in dollars per share)	$ 0.07	(1.03)	0.08	(1.34)	0.16	0.13	0.03	0.08	(2.22)	0.41	0.64
Cash dividend declared per share		$ 0.06	$ 0.06	$ 0.06	$ 0.06	$ 0.06	$ 0.06	$ 0.06	$ 0.18	$ 0.24	$ 0.24