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Stock-Based Compensation - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 2008 Equity Incentive Plan	Jun. 06, 2012 2008 Equity Incentive Plan	Mar. 31, 2013 Employee Stock Purchase Plan	Jun. 06, 2012 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase in shares of common stock authorized for issuance				3,000,000		500,000
Maximum number of shares of common stock authorized for issuance				13,540,940		1,320,500
Aggregate number of shares of common stock reserved for future issuance	12,800,000
Outstanding options and other stock based awards	10,700,000
Number of shares available for future issuance			2,100,000		600,000
Restricted stock units vesting Description	The restricted stock units generally vest in three annual installments from the date of grant and are generally issuable at the end of the three-year vesting term.
Performance-based stock options awards	$ 0	$ 0
Performance-based stock options, outstanding	50,000

Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant date.

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