Income Taxes - Summary of Provision for Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
United States federal tax statutory rate, Amount			$ (16,311)	$ (12,801)	$ (9,642)
State taxes (net of deferred benefit), Amount			(1,121)	(786)	(662)
Non-deductible expenses, Amount			1,797	253	1,556
Research & Development Credits, Amount			(1,281)	(1,532)
Change in unrecognized tax benefits, Amount			256	606
Foreign tax rate differential, Amount			175
Adjustment for valuation allowance recorded as part of purchase accounting, Amount					(11,785)
Other, net, Amount			532	392	(200)
Change in valuation allowance, Amount			14,929	$ 13,868	$ 20,733
Income tax benefit	$ (925)	$ (99)	$ (1,024)
United States federal tax statutory rate, Percent of Pretax Earnings			34.00%	34.00%	34.00%
State taxes (net of deferred benefit), Percent of Pretax Earnings			2.30%	2.00%	2.30%
Non-deductible expenses, Percent of Pretax Earnings			(3.70%)	(0.70%)	(5.50%)
Research & Development Credits, Percent of Pretax Earnings			2.70%	4.10%	0.00%
Change in unrecognized tax benefits, Percent of Pretax Earnings			(0.50%)	(1.60%)	0.00%
Foreign tax rate differential, Percent of Pretax Earnings			(0.40%)	0.00%	0.00%
Adjustment for valuation allowance recorded as part of purchase accounting, Percent of Pretax Earnings			0.00%	0.00%	41.60%
Other, net, Percent of Pretax Earnings			(1.20%)	(1.00%)	0.70%
Change in valuation allowance, Percent of Pretax Earnings			(31.10%)	(36.80%)	(73.10%)
Provision for income taxes, Percent of Pretax Earnings			2.10%	0.00%	0.00%