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
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues, net	$ 20,333	$ 27,188
Total long-lived assets, net	19,175		$ 20,581	[1]
United States of America [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues, net	13,612	18,740
Total long-lived assets, net	18,530		19,861
International [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues, net	6,721	$ 8,448
Total long-lived assets, net	$ 645		$ 720

[1] Derived from our audited consolidated financial statements as of December 31, 2016.