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Stock-Based Compensation, Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
Stock-Based Compensation [Abstract] |  |  |
Shares, Outstanding, Beginning Balance (in shares) | 3,572,116 |  |
Shares, Granted (in shares) | 199,438 |  |
Shares, Exercised (in shares) | (276,700) |  |
Shares, Forfeited or expired (in shares) | (31,874) |  |
Shares, Outstanding, Ending Balance (in shares) | 3,462,980 |  | 3,572,116
Shares, Exercisable (in shares) | 1,898,382 |  |
Shares, Vested and expected to vest (in shares) | 3,261,836 |  |
Weighted- Average Exercise Price, Outstanding, Beginning Balance (in dollars per share) | $ 11.40 |  |
Weighted- Average Exercise Price, Granted (in dollars per share) | 32.98 |  |
Weighted- Average Exercise Price, Exercised (in dollars per share) | 2.40 |  |
Weighted- Average Exercise Price, Forfeited or expired (in dollars per share) | 22.25 |  |
Weighted- Average Exercise Price, Outstanding, Ending Balance (in dollars per share) | 13.26 |  | $ 11.40
Weighted- Average Exercise Price, Exercisable (in dollars per share) | 6.58 |  |
Weighted- Average Exercise Price, Vested and expected to vest (in dollars per share) | $ 12.89 |  |
Weighted- Average Remaining Contractual Term, Outstanding | 6 years 10 months 24 days |  | 7 years 3 months 18 days
Weighted- Average Remaining Contractual Term, Exercisable | 5 years 7 months 6 days |  |
Weighted- Average Remaining Contractual Term, Vested and expected to vest | 6 years 10 months 24 days |  |
Aggregate Intrinsic Value, Outstanding, Ending Balance | $ 37,397 |  |
Aggregate Intrinsic Value, Exercisable | 29,810 |  |
Aggregate Intrinsic Value, Vested and expected to vest | $ 36,179 |  |
Weighted-average grant-date fair value of options granted (in dollars per share) | $ 21.95 |  |
Intrinsic value of options exercised | $ 8,600 |  |
Cash received for options exercised | 632 | $ 486 |
Fair value of shares vested | 4,900 |  |
Unrecognized compensation expense related to non-vested stock-options, net of related forfeiture estimates | $ 17,800 |  |
Unrecognized compensation expense recognition period | 3 years |  |

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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 The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + 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 (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3255-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the 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 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to 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)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + 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)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + 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 Reference 2: 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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