Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2012

Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]

Estimates Weighted-average Fair Value Per Share of Options Granted

The following weighted-average assumptions were used for each respective period to calculate our stock-based compensation for each stock option grant:

	Year Ended December 31,	Six Months Ended December 31,		Fiscal Year Ended June 30,
	2012	2011	2010	2011	2010
			(Unaudited)
Stock Options:
Expected volatility	53% - 57%	56% - 69%	57% - 67%	50% - 69%	65	%
Expected term (in years)	6.05	5.75	6.04	6.05	6.02
Risk-free interest rate	0.83% - 1.18%	0% - 1.92%	1.43% - 2.06%	1.43% - 2.96%	2.57% - 3.04%
Dividend yield	—	—	—	—	—

The following weighted-average assumptions were used to calculate our stock-based compensation for each stock purchase right granted under the Employee Stock Purchase Plan (ESPP), which became effective on June 28, 2012:

	Year Ended, December 31, 2012
ESPP:
Expected volatility	42	%
Expected term (in years)	0.58
Risk-free interest rate	0.16	%
Dividend yield	—