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Business Segment and Geographic Information (Details) $ in Thousands		1 Months Ended	3 Months Ended								6 Months Ended	9 Months Ended	12 Months Ended
	Apr. 12, 2016 segment	Apr. 30, 2016 segment	Dec. 31, 2016 USD ($)	Oct. 01, 2016 USD ($)	Jul. 02, 2016 USD ($)	Apr. 02, 2016 USD ($)	Jan. 02, 2016 USD ($)	Oct. 03, 2015 USD ($)	Jul. 04, 2015 USD ($)	Apr. 04, 2015 USD ($)	Jul. 02, 2016 segment	Dec. 31, 2016 USD ($) segment	Dec. 31, 2016 USD ($)	Jan. 02, 2016 USD ($) segment	Jan. 03, 2015 USD ($)
Business segment and geographic information
Number of business segments | segment	2	2									2	1		2
Revenues			$ 79,569	$ 81,691	$ 82,607	$ 80,912	$ 72,460	$ 76,525	$ 76,535	$ 78,039			$ 324,779	$ 303,559	$ 306,371
Long-lived assets (property and equipment, net)			36,381				31,338					$ 36,381	36,381	31,338
United States
Business segment and geographic information
Revenues													251,962	243,261	238,466
Long-lived assets (property and equipment, net)			30,735				29,877					30,735	30,735	29,877
United Kingdom
Business segment and geographic information
Revenues													52,509	44,248	49,127
Long-lived assets (property and equipment, net)			5,253				1,075					5,253	5,253	1,075
Other
Business segment and geographic information
Revenues													20,308	16,050	18,778
Long-lived assets (property and equipment, net)			393				386					393	393	386
Total foreign
Business segment and geographic information
Revenues													72,817	60,298	$ 67,905
Long-lived assets (property and equipment, net)			$ 5,646				$ 1,461					$ 5,646	$ 5,646	$ 1,461

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.13)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 13
-Subparagraph a
-Article 5

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 8
-Article 7

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(d))
-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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