Segment Reporting - Revenues by Geographic Area, Based on Billing Location of Customer and Long-Lived Assets, by Geographical Areas (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues, net	$ 26,775	$ 23,853	$ 53,188	$ 46,669
Total long-lived assets, net	19,686		19,686		$ 16,274	[1]
United States of America [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues, net	17,895	15,800	35,210	30,680
Total long-lived assets, net	18,931		18,931		15,701
International [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues, net	8,880	$ 8,053	17,978	$ 15,989
Total long-lived assets, net	$ 755		$ 755		$ 573

[1] Derived from our audited consolidated financial statements as of December 31, 2014.