Income Taxes - Summary of Provision for Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended						12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
United States federal tax statutory rate, Amount							$ (42,671)	$ (16,311)	$ (12,801)
State taxes (net of deferred benefit), Amount							(2,487)	(1,121)	(786)
Non-deductible expenses, Amount							667	1,797	253
Research & Development Credits, Amount							(922)	(1,281)	(1,532)
Change in unrecognized tax benefits, Amount							186	256	606
Foreign tax rate differential, Amount							3,969	175
Goodwill impairment, Amount							20,816
Change in enacted tax rates and other, net, Amount							(1,069)	532	392
Change in valuation allowance, Amount							15,988	14,929	$ 13,868
Income tax benefit	$ (816)	$ (1,070)	$ (992)	$ (2,645)	$ (925)	$ (99)	$ (5,523)	$ (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							2.00%	2.30%	2.00%
Non-deductible expenses, Percent of Pretax Earnings							(0.50%)	(3.70%)	(0.70%)
Research & Development Credits, Percent of Pretax Earnings							0.70%	2.70%	4.10%
Change in unrecognized tax benefits, Percent of Pretax Earnings							(0.10%)	(0.50%)	(1.60%)
Foreign tax rate differential, Percent of Pretax Earnings							(3.20%)	(0.40%)	0.00%
Goodwill impairment, Percent of Pretax Earnings							(16.60%)
Change in enacted tax rates and other, net, Percent of Pretax Earnings							0.80%	(1.20%)	(1.00%)
Change in valuation allowance, Percent of Pretax Earnings							(12.70%)	(31.10%)	(36.80%)
Provision for income taxes, Percent of Pretax Earnings							4.40%	2.10%	0.00%