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Organization and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Product Information [Line Items]
Cash, cash equivalents and marketable securities	$ 105,400,000
Amount reclassified out of accumulated other comprehensive income	$ 0	$ 0

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- Definition

Cash, cash equivalents and marketable securities.

+ References

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- Definition

Reclassification Adjustments from Accumulated Other Comprehensive Income

+ References

No definition available.

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Data Type:	xbrli:monetaryItemType
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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration