Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Contingency [Line Items]
Tax expense resulting from share-based compensation tax benefits	$ 6,900	$ 8,000	$ 6,800
Deferred tax assets, state NOLs	300
Deferred tax assets, federal NOLs	1,300
Deferred tax assets, foreign NOLs	$ 1,000
R&D credit carry forwards carry forwards expiration period	various dates between 2018 and 2029
Research and development tax credit studies	$ 12,000
Liability for unrecognized tax benefits	3,200
Threshold to favorably impact effective tax rate	3,400
Unrecognized tax benefits, accrued interest	55	$ 46
ARIZONA | Expiring in Two Thousand Ninteen
Income Tax Contingency [Line Items]
Minimum tax credit carryover	$ 1,200
State
Income Tax Contingency [Line Items]
NOL carry forward expiration date	various dates between 2016 and 2031
Liability for unrecognized tax benefits	$ 200
State | ARIZONA
Income Tax Contingency [Line Items]
State research and development credit carry forwards	5,800
State | CALIFORNIA
Income Tax Contingency [Line Items]
State research and development credit carry forwards	100
Federal
Income Tax Contingency [Line Items]
Federal research and development credit carry forwards	$ 43
Federal | CALIFORNIA
Income Tax Contingency [Line Items]
NOL carry forward expiration date	between 2031 and 2035