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Financial Instruments - Additional Information (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2011
Fair Value Of Financial Instruments [Line Items]
Cash and cash equivalents	$ 13,586,000	$ 22,994,000	$ 24,455,000	$ 12,724,000
Line of Credit Facility, Amount Outstanding	90,000,000	0
China [Member]
Fair Value Of Financial Instruments [Line Items]
Cash and cash equivalents	6,200,000	5,600,000
Netherlands Subsidiary [Member]
Fair Value Of Financial Instruments [Line Items]
Line of Credit Facility, Amount Outstanding	$ 3,500,000

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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