Acquisition - Additional Information (Detail) Share data in Millions, unless otherwise specified	12 Months Ended			0 Months Ended				0 Months Ended		12 Months Ended		12 Months Ended
	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2013 EUR (€)	Oct. 02, 2014 Acquisition of ATT Systems EUR (€)	Oct. 02, 2013 Acquisition of ATT Systems USD ($)	Oct. 02, 2013 Acquisition of ATT Systems EUR (€)	Sep. 30, 2013 Acquisition of ATT Systems USD ($)	Sep. 30, 2013 Acquisition of ATT Systems October 1, 2015 EUR (€)	Jul. 31, 2013 Acquisition of RTP USD ($)	Dec. 31, 2014 Acquisition of RTP USD ($)	Jul. 31, 2013 Acquisition of RTP Fair Value, Inputs, Level 3 Contingent consideration related to the RTP Acquisition USD ($)	Dec. 31, 2014 Acquisition of RTP Selling, general and administrative Fair Value, Inputs, Level 3 Contingent consideration related to the RTP Acquisition USD ($)
Business Acquisition [Line Items]
Total consideration net of cash acquired	$ 1,528,000	$ 13,253,000			$ 13,000,000	€ 9,600,000
Common stock issued in acquisition					1.6	1.6
Common stock issued in acquisition, value							14,500,000
Acquisition of certain assets in cash						8,800,000			1,900,000
Consideration to be paid				400,000				400,000
Total working capital adjustment		200,000	200,000
Weighted average amortization period					6 years 9 months 18 days	6 years 9 months 18 days				7 years 4 months 24 days
Business acquisition, transaction costs							700,000			200,000
Contingent consideration paid										800,000
Fair value of contingent consideration											1,300,000
Contingent consideration credited to selling, general and administrative expenses												$ 500,000