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Stock-Based Compensation (Narrative) (Details) (USD $) | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended |  |
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 Non-employees [Member] | Sep. 30, 2013 Maximum [Member] Non-employees [Member] | Sep. 30, 2014 2005 Stock Incentive Plan [Member] | Sep. 30, 2014 2005 Stock Incentive Plan [Member] Minimum [Member] | Sep. 30, 2014 2005 Stock Incentive Plan [Member] Maximum [Member] | Sep. 30, 2014 1995 Stock Option Plan [Member] | Sep. 30, 2014 1995 Stock Option Plan [Member] Minimum [Member] | Sep. 30, 2014 1995 Stock Option Plan [Member] Maximum [Member] | Sep. 30, 2014 Employee Stock Purchase Plan [Member] | Sep. 30, 2014 Employee Stock Purchase Plan [Member] | Apr. 11, 2013 Employee Stock Purchase Plan [Member] | Sep. 30, 2014 Employee Stock Purchase Plan [Member] Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock reserved for issuance |  |  |  |  |  |  | 26,312,192 |  |  | 5,746,468 |  |  | 1,619,202 | 1,619,202 | 2,000,000 | 3,000,000
Maximum term of options |  |  |  |  |  |  | 10 years |  |  | 10 years |  |  |  |  |  |
Minimum grant price, percent of common stock fair value |  |  |  |  |  |  | 100.00% |  |  | 100.00% |  |  |  |  |  |
Exercise period |  |  |  |  |  |  |  | 6 months | 4 years |  | 6 months | 4 years |  |  |  |
Aggregate intrinsic value of stock options outstanding | $ 25,800,000 |  | $ 25,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average remaining contractual term of stock options outstanding |  |  | 7 years 9 months 18 days |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate intrinsic value of stock options exercisable | 14,000,000 |  | 14,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average remaining contractual term of stock options exercisable |  |  | 6 years 2 months 12 days |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate intrinsic value of stock options exercised |  |  | 1,800,000 | 300,000 |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation expense | 13,300,000 |  | 13,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation expense, recognition period |  |  | 1 year 6 months |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in shares available for issuance approved at the 2014 annual stockholders' meeting |  |  |  |  |  |  | 4,000,000 |  |  |  |  |  |  |  |  |
Stock-based compensation expense | $ 1,691,000 | $ 663,000 | $ 4,583,000 | $ 1,784,000 | $ 300,000 | $ 100,000 |  |  |  |  |  |  | $ 200,000 | $ 500,000 |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: 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.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, 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 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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 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 Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + 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 Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, 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 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of 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 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, 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 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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