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Stock-Based Compensation (Details 3) (USD $) | 3 Months Ended | 6 Months Ended | 0 Months Ended | 1 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 30, 2013 Options | Jun. 30, 2012 Options | Jun. 30, 2013 Options | Jun. 30, 2012 Options | Feb. 28, 2013 ESPP | Jun. 30, 2010 ESPP Item | Jun. 30, 2013 ESPP
Stock-Based Compensation |  |  |  |  |  |  |
Outstanding options fully vested and expected to vest (in shares) | 9,900,000 |  | 9,900,000 |  |  |  |
Remaining contractual life of options fully vested and expected to vest |  |  | 3 years 6 months 4 days |  |  |  |
Weighted average exercise price of options fully vested and expected to vest (in dollars per share) | $ 4.14 |  | $ 4.14 |  |  |  |
Aggregate intrinsic value of options fully vested and expected to vest (in dollars) | $ 4,900,000 |  | $ 4,900,000 |  |  |  |
Fair value of shares vested (in dollars) |  |  | 1,600,000 | 1,100,000 |  |  |
Total intrinsic value of awards exercised (in dollars) |  |  | 600,000 | 1,100,000 |  |  |
Awards exercisable (in shares) |  | 6,600,000 |  | 6,600,000 |  |  |
Weighted average exercise price of awards exercisable (in dollars per share) |  | $ 4.28 |  | $ 4.28 |  |  |
Assumptions used in estimation of fair value of the share-based payment awards on the grant date |  |  |  |  |  |  |
Risk-free interest rate (as a percent) |  | 0.60% |  |  |  |  |
Risk-free interest rate, minimum (as a percent) | 0.50% |  | 0.50% | 0.60% |  |  |
Risk-free interest rate, maximum (as a percent) | 0.80% |  | 0.80% | 0.80% |  |  |
Volatility, minimum (as a percent) | 58.00% | 66.30% | 58.00% | 66.30% |  |  |
Volatility, maximum (as a percent) | 58.30% | 66.80% | 59.10% | 66.80% |  |  |
Expected life | 4 years | 4 years | 4 years | 4 years |  |  |
Dividend yield (as a percent) | 0.00% | 0.00% | 0.00% | 0.00% |  |  |
Period for which historical volatility is considered to determine expected volatility |  |  | 4 years |  |  |  |
Employee Stock Purchase Plan |  |  |  |  |  |  |
Number of shares reserved for issuance |  |  |  |  |  | 2,000,000 |
Maximum amount of shares that eligible employee may purchase annually (in dollars) |  |  |  |  |  | 25,000 |
Number of offering periods |  |  |  |  |  | 2 |
Offering period |  |  |  |  |  | 6 months |
Purchase price to be paid by participants as a percentage of price per share either at the beginning or the end of each six-month offering period, whichever is less |  |  |  |  |  | 85.00% |
Shares of common stock issued under the plan |  |  |  |  | 147,000 |  |
Aggregate purchase price (in dollars) |  |  |  |  | $ 426,000 |  |
Shares authorized and unissued |  |  |  |  |  |  | 1,189,000

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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph e(2)(c) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.D.2) -URI http://asc.fasb.org/extlink&oid=6793087&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section D -Subsection 2 + Details
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- Definition The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References No definition available. + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(c) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise prices of fully vested and expected to vest options outstanding. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph d(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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