Cash, cash equivalents and marketable securities.

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Cash Equivalents, Maturity Period

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- Definition

Number Of Reporting Units

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- Definition

Percentage Of Annualized Forfeiture Rate For Award Granted To Senior Executives And Employees

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Percentage of Long Lived Assets

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Percentage Of Revenue Earned

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- Definition

Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

The net realized foreign currency transaction gain (loss) (pretax) included in determining net income from transactions that were settled as of the balance sheet date.

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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The gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns as of the balance sheet date.

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This element represents the total of accruals as of the date of the statement of financial position for interest recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity and the amount of statutory penalties for a tax position claimed or expected to be claimed by the entity, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties.

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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of Operating Segment	1
Cash, cash equivalents and marketable securities	$ 125,100,000
Currency translation adjustments	(640,000)	(1,006,000)
Intangible asset, estimated useful lives	5 years
Number of reporting units	1
Unrecognized tax benefits	0
Unrecognized tax benefits, accrued amounts for interest and penalties	0
Employee Stock Option \| Senior Management Group
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Estimated annual forfeiture rate	5.00%
Employee Stock Option \| All Other Employees
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Estimated annual forfeiture rate	13.00%
Maximum
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Cash equivalents original maturity period	3 months
Rhein
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Currency translation adjustments	400,000	(300,000)	(600,000)
Currency transaction gain (loss)	$ (200,000)	$ 200,000	$ (100,000)
UNITED STATES
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Percentage of revenue earned	88.00%	94.00%	98.00%
Percentage of long lived assets	10.00%	14.00%