Accrued Liabilities (Detail) - USD ($)	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Accrued salaries and benefits	$ 6,437,000	$ 3,637,000
Accrued judgments and settlements	0	65,000
Accrued professional fees	86,000	718,000
Accrued warranty expense	449,000	314,000	$ 523,000	$ 675,000
Accrued income and other taxes	1,011,000	1,215,000
Other accrued expenses	4,643,000	2,694,000
Accrued liabilities	12,626,000	8,643,000
Long-term business acquisition contingent consideration	0	952,000
Accrued stock repurchase expenses	2,600,000
MediaSolv Solutions Corporation
Business Acquisition [Line Items]
Accrued salaries and benefits	1,900,000	0
Long-term business acquisition contingent consideration		1,000,000
Tactical Safety Responses Limited
Business Acquisition [Line Items]
Accrued salaries and benefits	$ 300,000	$ 0