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Stock Option Plans and Share-Based Compensation-Narrative (Details) (USD $) | 12 Months Ended |  | 0 Months Ended | 12 Months Ended |  |  |  | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Equity Option [Member] | Dec. 31, 2013 Employee Stock Option [Member] | May 21, 2013 2009 Equity Incentive Plan [Member] | Dec. 31, 2013 2009 Equity Incentive Plan [Member] | Dec. 31, 2012 2009 Equity Incentive Plan [Member] | Dec. 31, 2010 2009 Equity Incentive Plan [Member] | May 19, 2009 2009 Equity Incentive Plan [Member] | Dec. 31, 2013 2009 Equity Incentive Plan [Member] Employee Stock Option [Member] VestingInstallment | Dec. 31, 2013 Employee Stock Purchase Plan [Member] | Dec. 31, 2009 Employee Stock Purchase Plan [Member] | Dec. 31, 2013 Employee Stock Purchase Plan [Member] Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized |  |  |  |  |  |  |  |  |  | 2,100,000 |  |  |  |
Number of shares not available for grant for each share granted |  |  |  |  |  |  | 1.40 | 1.40 | 0 |  |  |  |  |
Number of additional shares authorized |  |  |  |  |  | 2,500,000 | 2,600,000 |  |  |  |  |  | 2,622,426 |
Award vesting period |  |  |  |  |  |  |  |  |  |  | 4 years |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Monthly Vesting Installments After Initial Cliff |  |  |  |  |  |  |  |  |  |  | 36 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |
Maximum annual contribution per employee, percent |  |  |  |  |  |  |  |  |  |  |  | 15.00% |  |
Maximum annual contribution per employee |  |  |  |  |  |  |  |  |  |  |  | $ 25,000 |  |
Purchase price of stock, percent |  |  |  |  |  |  |  |  |  |  |  |  |  | 85.00%
Number of shares available for grant | 3,060,505 |  |  |  |  |  |  |  |  |  |  | 1,097,998 |  |
Stock Issued During Period, Shares, Employee Stock Purchase Plans |  |  |  |  |  |  |  |  |  |  |  | 450,713 |  |
Stock Issued Since Plan Inception, Shares Employee Stock Purchase Plans |  |  |  |  |  |  |  |  |  |  |  | 4,233,557 |  |
Total compensation cost not yet recognized |  |  |  |  | 7,100,000.00 |  |  |  |  |  |  | 1,176,000 |  |
Period for recognition |  |  |  | 2 years 8 months 12 days |  |  | 2 years 8 months 12 days |  |  |  |  | 7 months 18 days |  |
Maximum employee subscription rate contribution per employee, percent | 75.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Employer matching contribution, percent | 3.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum annual contribution per employee | 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Cost recognized | 1,100,000 | 800,000 | 600,000 |  |  |  |  |  |  |  |  |  |  |
Total compensation cost not yet recognized |  |  |  |  |  |  | $ 7,100,000 |  |  |  |  |  |  |

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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 + 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 Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Period from grant date that an equity-based award expires, 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 (a)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The highest percentage of annual salary that an employee is permitted to utilize with respect to the 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 -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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