Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2015	Dec. 31, 2011
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	35.00%	35.00%	35.00%
Change in valuation allowance	$ 26,053,000	$ (996,000)	$ (1,104,000)
Deferred Tax Assets, Valuation Allowance	75,199,000	38,644,000	34,347,000		28,354,000
Decrease in balance as a result of a lapse of the applicable statues of limitations	9,500,000	1,300,000	900,000
Income tax benefit from reinstatement of US federal research tax credit	841,000	5,044,000	0
Gross unrecognized tax benefits including interest and penalties	15,700,000
Income Tax Examination, Increase (Decrease) in Liability from Prior Year	1,000,000	5,600,000
Income Tax Examination, Penalties and Interest Expense			1,900,000
Accrued potential interest related to unrecognized tax benefits	500,000	1,500,000
Cumulative Undistributed Earnings of non-U.S. subsidiaries intended to be indefinitely reinvested	17,100,000
More Likely Than Not Threshold Recognition of Uncertain Tax Position	50.00%
Domestic Tax Authority [Member]
Deferred Income Tax Expense (Benefit)	34,000,000
State [Member]
Operating Loss Carryforwards	54,500,000
Tax credit carryovers	29,900,000
Tax credit expiration	will not expire
Foreign [Member]
Operating Loss Carryforwards	84,900,000
Federal [Member]
Tax credit carryovers	7,800,000
Year that federal tax credits expire	Jan. 01, 2031
Federal [Member] | American Taxpayer Relief Act [Member]
Income tax benefit from reinstatement of US federal research tax credit	2,400,000
Federal [Member] | Net Operating Loss due to Stock Options [Member]
Tax credit carryovers	7,800,000
Federal AMT [Member]
Tax credit carryovers	2,700,000
Tax credit expiration	will not expire
Switzerland [Member]
Tax savings due to reduction in tax rate	700,000	1,500,000	1,100,000
Increase in diluted earnings per share	$ 0.008	$ 0.014	$ 0.009
Benefits from a tax ruling	The Company's operations in Switzerland are subject to a reduced tax rate under the Switzerland tax holiday which requires various thresholds of investment and employment in Switzerland.
Additional period for renewal for investment and employment in foreign country	effective through the end of 2018
Minimum [Member] | State [Member]
Operating loss carryforwards, expiration date	Jan. 01, 2015
Maximum [Member] | State [Member]
Operating loss carryforwards, expiration date	Jan. 01, 2034
Maximum [Member] | Scenario, Forecast [Member]
Decrease in balance as a result of a lapse of the applicable statues of limitations				900,000
Valuation Allowance of Deferred Tax Assets [Member] | Domestic Tax Authority [Member]
Change in valuation allowance	29,000,000
Federal NOL Carryback and R&D Credits [Member] | Domestic Tax Authority [Member]
Change in valuation allowance	(5,000,000)
Tax Year 2010 [Member] | Internal Revenue Service (IRS) [Member]
Decrease in balance as a result of a lapse of the applicable statues of limitations	9,000,000
Tax Year 2008 and 2009 [Member] | Internal Revenue Service (IRS) [Member]
Decrease in balance as a result of a lapse of the applicable statues of limitations		$ 39,000,000