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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Summary of ESPP Share Activity | The following is a summary of 2009 and 2019 ESPP share activity for the nine months ended September 30, 2019:
|  | Shares |
Available for future purchases, January 1, 2019 |  |  | 183,244 |
Additional shares reserved under 2009 ESPP |  |  | 85,162 |
Additional shares reserved under 2019 ESPP |  |  | 300,000 |
Purchases |  |  | (102,343 | )
Available for future purchases, September 30, 2019 |  |  | 466,063 |

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- Definition Tabular disclosure of employee stock purchase plan activity. + 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=116856206&loc=d3e5070-113901 + Details
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