Income Taxes - Reconciliation of Income Tax Computed at Federal Statutory Rate to Income Before Taxes (Detail)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Effective Income Tax Rate Reconciliation, Percent [Abstract]
U.S. Federal statutory rate	(34.00%)	(34.00%)	(34.00%)
State taxes net of federal benefit	(4.40%)	(5.70%)	(5.50%)
Foreign rate differential and transactional tax	1.20%	(0.50%)	(0.70%)
Impact of foreign tax holiday	3.40%	(1.50%)	(1.80%)
Valuation allowance	33.30%	41.80%	26.90%
Other	0.50%	0.10%	0.60%
Effective income tax rate		0.20%	(14.50%)