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Stock-Based Compensation (Details 2) (USD $) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012
Range of Exercise Price 0.09-2.00 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit | $ 0.09 | $ 0.09
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit | $ 2.00 | $ 2.00
Options Outstanding, Options | 2,093,196 | 2,162,362
Options Outstanding, Weighted Average Exercise Price | $ 1.29 | $ 1.78
Options Outstanding, Weighted Average Remaining Contractual Life | 4 years 8 months 23 days | 5 years 9 months 4 days
Options Exercisable, Options | 1,901,737 | 1,801,187
Options Exercisable, Weighted Average Exercise Price | $ 1.25 | $ 1.14
Options Exercisable, Weighted Average Remaining Contractual Life | 4 years 7 months 20 days | 5 years 6 months 7 days
Range of Exercise Price 2.01-3.00 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit | $ 2.01 | $ 2.01
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit | $ 3.00 | $ 3.00
Options Outstanding, Options | 1,770,560 | 2,212,227
Options Outstanding, Weighted Average Exercise Price | $ 2.28 | $ 2.26
Options Outstanding, Weighted Average Remaining Contractual Life | 6 years 7 months 24 days | 7 years 1 month 24 days
Options Exercisable, Options | 1,205,976 | 1,011,533
Options Exercisable, Weighted Average Exercise Price | $ 2.26 | $ 2.17
Options Exercisable, Weighted Average Remaining Contractual Life | 6 years 3 months | 6 years 1 month 20 days
Range of Exercise Price 3.01-6.00 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit | $ 3.01 | $ 3.01
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit | $ 6.00 | $ 6.00
Options Outstanding, Options | 45,824 | 79,157
Options Outstanding, Weighted Average Exercise Price | $ 5.24 | $ 4.87
Options Outstanding, Weighted Average Remaining Contractual Life | 3 years 7 months 13 days | 4 years 5 months 26 days
Options Exercisable, Options | 45,824 | 79,157
Options Exercisable, Weighted Average Exercise Price | $ 5.24 | $ 4.87
Options Exercisable, Weighted Average Remaining Contractual Life | 3 years 7 months 13 days | 4 years 5 months 26 days
Range of Exercise Price 0.09-6.00 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit | $ 0.09 | $ 0.09
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit | $ 6.00 | $ 6.00
Options Outstanding, Options | 3,909,580 | 4,453,746
Options Outstanding, Weighted Average Exercise Price | $ 1.78 | $ 1.78
Options Outstanding, Weighted Average Remaining Contractual Life | 5 years 7 months 2 days | 6 years 5 months 5 days
Options Exercisable, Options | 3,153,537 | 2,891,877
Options Exercisable, Weighted Average Exercise Price | $ 1.69 | $ 1.60
Options Exercisable, Weighted Average Remaining Contractual Life | 5 years 2 months 26 days | 5 years 8 months 16 days

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- Definition Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term of exercisable stock options, 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + 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 (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices. + 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)(i)-(ii) -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 could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term of outstanding stock options, 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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- Definition The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + 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 (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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