Fair Value Measurement - Company's Fair Value Hierarchy for its Financial Assets and Liabilities (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Financial assets:
Total financial assets	$ 4,084	$ 4,084
Financial liabilities:
Total financial liabilities	6,909
Zero2Ten and Branchbird Contingent Earnout Consideration [Member]
Financial liabilities:
Total financial liabilities	6,909
Money Market Investment [Member]
Financial assets:
Total financial assets	4,084	4,084
Quoted Prices in Active Markets for Identical Items (Level1) [Member]
Financial assets:
Total financial assets	4,084	4,084
Quoted Prices in Active Markets for Identical Items (Level1) [Member] | Money Market Investment [Member]
Financial assets:
Total financial assets	4,084	$ 4,084
Significant Unobservable Inputs (Level 3) [Member]
Financial liabilities:
Total financial liabilities	6,909
Significant Unobservable Inputs (Level 3) [Member] | Zero2Ten and Branchbird Contingent Earnout Consideration [Member]
Financial liabilities:
Total financial liabilities	$ 6,909