Acquisitions - Additional Information (Detail) - USD ($)		3 Months Ended			6 Months Ended		12 Months Ended
	Feb. 27, 2015	Jun. 30, 2016	Jun. 30, 2015	Mar. 31, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015	May 05, 2015
Business Acquisition [Line Items]
Business acquisition, acquired entity name					Nexgen Wireless, Inc.
Business acquisition, effective date					Feb. 27, 2015
Asset purchase, date of agreement					Feb. 27, 2015
Contingent consideration related to claims escrow		$ 0			$ 0		$ 0
Goodwill		3,332,000			3,332,000		3,332,000
Amortization of intangible assets		$ 577,000	$ 943,000		$ 1,180,000	$ 1,578,000
Pro Forma [Member]
Business Acquisition [Line Items]
Amortization of intangible assets				$ 300,000
Nexgen Wireless, Inc. [Member]
Business Acquisition [Line Items]
Provisional purchase consideration	$ 21,400,000
Cash paid	18,250,000						20,500,000
Contingent consideration related to claims escrow	2,250,000						91,000
Business acquisition estimated excess working capital paid	800,000
Potential earn-out at fair value	100,000
Acquisition related transaction costs	$ 800,000
Weighted average amortization period of intangible assets	5 years
Percentage of revenue					78.00%
Goodwill							3,332,000
Assembled workforce, goodwill earned							$ 1,500,000
Nexgen APA Amendment [Member]
Business Acquisition [Line Items]
Contingent consideration related to claims escrow								$ 1,000,000
Portion of accounts receivable transferred								800,000
Escrowed funds payable								2,250,000
Nexgen APA Amendment [Member] | Estimated Fair Value [Member]
Business Acquisition [Line Items]
Contingent consideration related to claims escrow								$ 2,000,000