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Stock-Based Compensation - Range of Exercise Prices (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Stock options to purchase common stock |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range |  |  |
Total intrinsic value of stock options exercised during the period | $ 5.6 | $ 4.3 | $ 1.0
Unrecognized compensation expense related to unvested stock options | $ 29.7 |  |
Expected weighted average period for recognizing unrecognized compensation expense | 2 years 4 months 24 days |  |
$3.03 to $4.55 |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range |  |  |
Range of Exercise Prices lower range limit (in dollars per share) | $ 3.03 |  |
Range of Exercise Prices upper range limit (in dollars per share) | $ 4.55 |  |
Number of Options outstanding (in shares) | 960,038 |  |
Weighted Average Remaining Contractual Term (in years) | 3 years 7 months 13 days |  |
Outstanding Options, Weighted Average Exercise Price (in dollars per share) | $ 3.60 |  |
Number of Options exercisable (in shares) | 960,038 |  |
Exercisable Options, Weighted Average Exercise Price (in dollars per share) | $ 3.60 |  |
$6.90 to $6.90 |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range |  |  |
Range of Exercise Prices lower range limit (in dollars per share) | 6.90 |  |
Range of Exercise Prices upper range limit (in dollars per share) | $ 6.90 |  |
Number of Options outstanding (in shares) | 120,403 |  |
Weighted Average Remaining Contractual Term (in years) | 4 years 1 month 17 days |  |
Outstanding Options, Weighted Average Exercise Price (in dollars per share) | $ 6.90 |  |
Number of Options exercisable (in shares) | 120,403 |  |
Exercisable Options, Weighted Average Exercise Price (in dollars per share) | $ 6.90 |  |
$6.96 to $10.85 |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range |  |  |
Range of Exercise Prices lower range limit (in dollars per share) | 6.96 |  |
Range of Exercise Prices upper range limit (in dollars per share) | $ 10.85 |  |
Number of Options outstanding (in shares) | 953,089 |  |
Weighted Average Remaining Contractual Term (in years) | 6 years 10 months 6 days |  |
Outstanding Options, Weighted Average Exercise Price (in dollars per share) | $ 10.76 |  |
Number of Options exercisable (in shares) | 604,037 |  |
Exercisable Options, Weighted Average Exercise Price (in dollars per share) | $ 10.71 |  |
$11.14 to $12.58 |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range |  |  |
Range of Exercise Prices lower range limit (in dollars per share) | 11.14 |  |
Range of Exercise Prices upper range limit (in dollars per share) | $ 12.58 |  |
Number of Options outstanding (in shares) | 947,839 |  |
Weighted Average Remaining Contractual Term (in years) | 4 years 8 months 19 days |  |
Outstanding Options, Weighted Average Exercise Price (in dollars per share) | $ 12.17 |  |
Number of Options exercisable (in shares) | 887,207 |  |
Exercisable Options, Weighted Average Exercise Price (in dollars per share) | $ 12.18 |  |
$12.66 to $13.94 |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range |  |  |
Range of Exercise Prices lower range limit (in dollars per share) | 12.66 |  |
Range of Exercise Prices upper range limit (in dollars per share) | $ 13.94 |  |
Number of Options outstanding (in shares) | 967,420 |  |
Weighted Average Remaining Contractual Term (in years) | 7 years 3 months 21 days |  |
Outstanding Options, Weighted Average Exercise Price (in dollars per share) | $ 13.62 |  |
Number of Options exercisable (in shares) | 455,114 |  |
Exercisable Options, Weighted Average Exercise Price (in dollars per share) | $ 13.59 |  |
$14.24 to $16.07 |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range |  |  |
Range of Exercise Prices lower range limit (in dollars per share) | 14.24 |  |
Range of Exercise Prices upper range limit (in dollars per share) | $ 16.07 |  |
Number of Options outstanding (in shares) | 1,142,513 |  |
Weighted Average Remaining Contractual Term (in years) | 5 years 9 months 3 days |  |
Outstanding Options, Weighted Average Exercise Price (in dollars per share) | $ 15.31 |  |
Number of Options exercisable (in shares) | 782,818 |  |
Exercisable Options, Weighted Average Exercise Price (in dollars per share) | $ 15.22 |  |
$16.09 to $17.16 |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range |  |  |
Range of Exercise Prices lower range limit (in dollars per share) | 16.09 |  |
Range of Exercise Prices upper range limit (in dollars per share) | $ 17.16 |  |
Number of Options outstanding (in shares) | 1,380,220 |  |
Weighted Average Remaining Contractual Term (in years) | 7 years 6 months 29 days |  |
Outstanding Options, Weighted Average Exercise Price (in dollars per share) | $ 16.69 |  |
Number of Options exercisable (in shares) | 687,691 |  |
Exercisable Options, Weighted Average Exercise Price (in dollars per share) | $ 16.57 |  |
$17.24 to $22.76 |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range |  |  |
Range of Exercise Prices lower range limit (in dollars per share) | 17.24 |  |
Range of Exercise Prices upper range limit (in dollars per share) | $ 22.76 |  |
Number of Options outstanding (in shares) | 1,387,909 |  |
Weighted Average Remaining Contractual Term (in years) | 6 years 6 months 3 days |  |
Outstanding Options, Weighted Average Exercise Price (in dollars per share) | $ 21.04 |  |
Number of Options exercisable (in shares) | 1,081,677 |  |
Exercisable Options, Weighted Average Exercise Price (in dollars per share) | $ 21.31 |  |
$22.84 to $30.46 |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range |  |  |
Range of Exercise Prices lower range limit (in dollars per share) | 22.84 |  |
Range of Exercise Prices upper range limit (in dollars per share) | $ 30.46 |  |
Number of Options outstanding (in shares) | 1,355,366 |  |
Weighted Average Remaining Contractual Term (in years) | 8 years 4 months 13 days |  |
Outstanding Options, Weighted Average Exercise Price (in dollars per share) | $ 28.54 |  |
Number of Options exercisable (in shares) | 57,644 |  |
Exercisable Options, Weighted Average Exercise Price (in dollars per share) | $ 25.41 |  |
$30.86 to $32.46 |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range |  |  |
Range of Exercise Prices lower range limit (in dollars per share) | 30.86 |  |
Range of Exercise Prices upper range limit (in dollars per share) | $ 32.46 |  |
Number of Options outstanding (in shares) | 166,933 |  |
Weighted Average Remaining Contractual Term (in years) | 8 years 7 months 6 days |  |
Outstanding Options, Weighted Average Exercise Price (in dollars per share) | $ 31.20 |  |
Number of Options exercisable (in shares) | 13,069 |  |
Exercisable Options, Weighted Average Exercise Price (in dollars per share) | $ 31.57 |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested options awarded to employees as compensation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(iii) -URI http://asc.fasb.org/extlink&oid=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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