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Stock-Based Compensation - Summary of 2009 ESPP (Details) - $ / shares | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted average per share discount from market value for shares purchased (in dollars per share) | $ 17.83 | $ 13.10 | $ 15.20
The 2009 ESPP |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares purchased pursuant to 2009 ESPP | 112,138 |  |
Weighted average per share price of shares purchased (in dollars per share) | $ 101.03 |  |
Weighted average per share discount from market value for shares purchased (in dollars per share) | $ 17.83 |  |
Shares available for purchase pursuant to 2009 ESPP | 1,526,505 |  |

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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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