Income Taxes - Schedule of Reconciliation between Statutory Income Tax Rate and Company's Effective Income Tax Provision (Benefit) Rate (Detail)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income tax rate at federal statutory rates	35.00%	35.00%	35.00%
Federal net operating loss and tax credit adjustments	24.40%	(0.68%)	0.72%
State taxes, net of federal benefit	(58.42%)	0.56%	1.32%
State net operating loss revaluation	(19.74%)	(2.51%)	(3.78%)
Nondeductible equity-based compensation	(275.10%)	0.15%	0.63%
Tax credits	21.17%	(1.73%)	(0.80%)
Nondeductible expenses	(17.15%)	0.53%	1.17%
Charitable contribution carryforward valuation allowance		2.01%	1.91%
Other	(1.63%)	(0.79%)	0.47%
Income tax rate	(291.47%)	32.54%	36.64%