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Stock Benefit Plans (Tables) | 6 Months Ended
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Dec. 31, 2012
Schedule of Weighted Average Black-Scholes Model Assumptions and Weighted Average Grant Date Fair Value of Employee Stock Options | price equal to the fair value of the common stock at the date of grant. The weighted average Black-Scholes model assumptions and the weighted average grant date fair value of employee stock options for the three and six months ended December 31, 2012 and 2011 were as follows:
|  | Three Months Ended December 31, |  |  | Six Months Ended December 31, |
|  | 2012 |  |  | 2011 |  |  | 2012 |  |  | 2011 |
Expected term (in years) |  |  | 4.6 |  |  |  | 4.6 |  |  |  | 4.6 |  |  |  | 4.6 |
Expected volatility |  |  | 54 | % |  |  | 56 | % |  |  | 55 | % |  |  | 55 | %
Expected dividend yield |  |  | 0.0 | % |  |  | 0.0 | % |  |  | 0.0 | % |  |  | 0.0 | %
Risk-free interest rate |  |  | 0.8 | % |  |  | 0.9 | % |  |  | 0.7 | % |  |  | 1.1 | %
Grant date fair value |  | $ | 3.07 |  |  | $ | 5.20 |  |  | $ | 3.97 |  |  | $ | 5.32 |

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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