Income Taxes - Components of Company's Income Tax Provision (Benefit) (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current tax expense:
Federal		$ 0	$ 0	$ 0
State		161	377	234
Foreign		264	68	95
Total		425	445	329
Deferred tax expense (benefit):
Federal		(544)	2,092	5,088
State		476	709	748
Foreign		205	301
Change in valuation allowance	$ (3,600)	3,000		(36,226)
Total		3,137	3,102	(30,390)
Unrecognized tax benefit		(33)	(370)	(28)
Income tax provision (benefit)		$ 3,529	$ 3,177	$ (30,089)