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Stock-Based Compensation (Details 2) - $ / shares | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Range of Exercise Price 0.09-2.00 [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Options Outstanding, Range of Exercise Price Lower | $ 0.09 | $ 0.09 | $ 0.09
Options Outstanding, Range of Exercise Price Upper | $ 2.00 | $ 2.00 | $ 2.00
Options Outstanding, Options | 3,029,938 | 2,703,280 | 2,093,196
Options Outstanding, Weighted Average Exercise Price | $ 1.40 | $ 1.37 | $ 1.29
Options Outstanding, Weighted Average Remaining Contractual Life | 4 years 1 month 13 days | 4 years 3 months 29 days | 4 years 8 months 23 days
Options Exercisable, Options | 2,363,683 | 2,018,074 | 1,901,737
Options Exercisable, Weighted Average Exercise Price | $ 1.34 | $ 1.28 | $ 1.25
Options Exercisable, Weighted Average Remaining Contractual Life | 3 years 4 months 17 days | 3 years 8 months 23 days | 4 years 7 months 20 days
Range of Exercise Price 2.01-3.00 [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Options Outstanding, Range of Exercise Price Lower | $ 2.01 | $ 2.01 | $ 2.01
Options Outstanding, Range of Exercise Price Upper | $ 3.00 | $ 3.00 | $ 3.00
Options Outstanding, Options | 5,866,168 | 3,232,002 | 1,770,560
Options Outstanding, Weighted Average Exercise Price | $ 2.50 | $ 2.49 | $ 2.28
Options Outstanding, Weighted Average Remaining Contractual Life | 6 years 6 months | 7 years 29 days | 6 years 7 months 24 days
Options Exercisable, Options | 2,348,247 | 1,829,298 | 1,205,976
Options Exercisable, Weighted Average Exercise Price | $ 2.44 | $ 2.40 | $ 2.26
Options Exercisable, Weighted Average Remaining Contractual Life | 5 years 9 months 4 days | 6 years 8 months 23 days | 6 years 3 months
Range of Exercise Price 3.01-6.00 [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Options Outstanding, Range of Exercise Price Lower | $ 3.01 | $ 3.01 | $ 3.01
Options Outstanding, Range of Exercise Price Upper | $ 6.00 | $ 6.00 | $ 6.00
Options Outstanding, Options | 45,824 | 45,824 | 45,824
Options Outstanding, Weighted Average Exercise Price | $ 5.24 | $ 5.24 | $ 5.24
Options Outstanding, Weighted Average Remaining Contractual Life | 1 year 7 months 13 days | 2 years 7 months 13 days | 3 years 7 months 13 days
Options Exercisable, Options | 45,824 | 45,824 | 45,824
Options Exercisable, Weighted Average Exercise Price | $ 5.24 | $ 5.24 | $ 5.24
Options Exercisable, Weighted Average Remaining Contractual Life | 1 year 7 months 13 days | 2 years 7 months 13 days | 3 years 7 months 13 days
Range of Exercise Price 0.09-6.00 [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Options Outstanding, Range of Exercise Price Lower | $ 0.09 | $ 0.09 | $ 0.09
Options Outstanding, Range of Exercise Price Upper | $ 6.00 | $ 6.00 | $ 6.00
Options Outstanding, Options | 8,941,930 | 5,981,106 | 3,909,580
Options Outstanding, Weighted Average Exercise Price | $ 2.14 | $ 2.01 | $ 1.78
Options Outstanding, Weighted Average Remaining Contractual Life | 5 years 8 months 1 day | 5 years 9 months 18 days | 5 years 7 months 2 days
Options Exercisable, Options | 4,757,754 | 3,893,196 | 3,153,537
Options Exercisable, Weighted Average Exercise Price | $ 1.92 | $ 1.85 | $ 1.69
Options Exercisable, Weighted Average Remaining Contractual Life | 4 years 6 months 14 days | 5 years 1 month 13 days | 5 years 2 months 26 days

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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 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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- 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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