Income Taxes - Reconciliation of Provision for Income Taxes at Statutory Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Tax benefit at federal statutory tax rate	$ (16,388)	$ (19,718)	$ (8,688)
Tax benefit at state statutory tax rate	(499)	(1,169)	(829)
Foreign tax rate differential	(826)	(526)	(705)
Unbenefitted loss of consolidated investment	0	2,366	2,402
Change in valuation allowance	9,738	12,407	7,400
Meals and entertainment	44	34	197
Stock compensation	8,492	7,160	810
Nondeductible expenses and other	121	627	190
Provision for income taxes	$ 682	$ 1,181	$ 777