Business Acquisitions (Details) - USD ($)				3 Months Ended	12 Months Ended
	Dec. 30, 2016	Jul. 16, 2015	May 05, 2015	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2015
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Goodwill					$ 10,442,000	$ 9,596,000
MediaSolv Solutions Corporation
Business Acquisition [Line Items]
Total purchase price			$ 8,800,000	$ 1,000,000	1,500,000	200,000
Cash acquired			100,000
Payments to acquire businesses, net			7,800,000
Contingent liability			1,000,000
Additional earn-out provisions and compensation adjustments			4,000,000
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Accounts receivable and other current assets			590,000
Inventory			35,000
Property and equipment			53,000
Intangible assets			4,145,000
Goodwill			5,496,000
Accounts payable and accrued liabilities			(697,000)
Deferred revenue			(111,000)
Deferred income tax liabilities, net			(688,000)
Total purchase price			$ 8,823,000
Intangible assets, weighted average useful life			6 years 6 months
Acquisition transaction costs			$ 200,000
MediaSolv Solutions Corporation | Accrued Liabilities
Business Acquisition [Line Items]
Contingent liability					200,000
Tactical Safety Responses Limited
Business Acquisition [Line Items]
Total purchase price		$ 3,300,000
Cash acquired		700,000
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Accounts receivable and other current assets		726,000
Inventory		497,000
Property and equipment		583,000
Other Assets		20,000
Intangible assets		881,000
Goodwill		1,441,000
Accounts payable and accrued liabilities		(207,000)
Notes payable		(169,000)
Deferred income tax liabilities, net		(438,000)
Total purchase price		$ 3,334,000
Intangible assets, weighted average useful life		7 years
Acquisition transaction costs		$ 100,000
Cash payments to acquire businesses		$ 4,000,000
Tactical Safety Responses Limited | Sales, general and administrative expenses
Business Acquisition [Line Items]
Contingent liability					$ 100,000	$ 0
Axon Artificial Intelligence
Business Acquisition [Line Items]
Contingent liability	$ 3,300,000
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Intangible assets	5,210,000
Goodwill	1,615,000
Total purchase price	$ 6,825,000
Intangible assets, weighted average useful life	5 years
Cash payments to acquire businesses	$ 3,500,000