Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Tax Credit Carryforward
Deferred tax assets, valuation allowance	$ 8,161	$ 4,850
Unrecognized tax benefits	5,703	8,566	$ 7,035	$ 5,445
Reductions for tax positions of prior years	3,913	12	$ 243
Current income tax benefit due to recognition of unrecognized tax benefits	1,600
Unrecognized tax benefits that would decrease effective tax rate in period	2,100
Tax Year 2010
Tax Credit Carryforward
Reductions for tax positions of prior years	3,800
Due To Arizona Credits
Tax Credit Carryforward
Increase in valuation allowance	400
Federal
Tax Credit Carryforward
Net operating loss carryforwards	46,200
Net operating loss carryforwards associated with windfall tax benefits	37,600
Federal | Research Tax Credit Carryforward
Tax Credit Carryforward
Tax credit carryforwards	12,300
Additional paid-in capital when realized associated with windfall tax benefits	$ 7,400
Tax credits carryforward period	20 years
State and Local Jurisdiction | Research Tax Credit Carryforward
Tax Credit Carryforward
Tax credit carryforwards	$ 12,900
Additional paid-in capital when realized associated with windfall tax benefits	2,500
California
Tax Credit Carryforward
Net operating loss carryforwards	43,600
Net operating loss carryforwards associated with windfall tax benefits	35,500
Other Jurisdictions
Tax Credit Carryforward
Net operating loss carryforwards	$ 16,800
Net operating loss carryforwards associated with windfall tax benefits		$ 2,800
Arizona | Research Tax Credit Carryforward
Tax Credit Carryforward
Tax credits carryforward period	15 years