Income Taxes - Additional Information (Detail) € in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2016 EUR (€)	Dec. 14, 2016 USD ($)	Sep. 30, 2015 USD ($)
Income Taxes [Line Items]
Valuation allowance increase (decrease)	$ (8,535)	$ 1,216	$ 727
Deferred tax liability resulting from issuance of convertible senior notes	6,514
Deferred tax assets from share-based payments	1,722	1,079
Impact of unrecognized tax benefits on effective tax rate		1,407
Interest and penalties related to uncertain tax positions	16
Earnings of foreign subsidiaries permanently reinvest outside the U.S	$ 43,679
Latest Tax Year
Income Taxes [Line Items]
Net operating loss and business tax credit carry forwards expiration date	At various dates through December 2036
Generated between 2008 and 2009
Income Taxes [Line Items]
Payment to DOR		1,012
Liability for an uncertain tax position						$ 926
Domestic Tax Authority
Income Taxes [Line Items]
Business tax credit carryforward	$ 1,745
State
Income Taxes [Line Items]
Business tax credit carryforward	442
Available to Reduce Future Federal Income Taxes
Income Taxes [Line Items]
Deferred tax assets from share-based payments	14,177
Reserves for business tax credits	1,407
Available to Reduce Future Federal Income Taxes | General Business Tax Credit Carryforward
Income Taxes [Line Items]
Business tax credit carryforward	2,814
Research and Development Credit | Generated between 2010 and 2011
Income Taxes [Line Items]
Payment to DOR		$ 141
TangenX Technology Corporation
Income Taxes [Line Items]
Deferred tax liabilities	4,525				$ 4,525
United States
Income Taxes [Line Items]
Net operating loss carry forwards	48,550
Germany
Income Taxes [Line Items]
Net operating loss carry forwards	$ 2,407			€ 2,287