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Share-Based Compensation - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Percentage of average closing price to be paid by employees |  |  | 85.00% |
Maximum common stock purchases through advance payroll deductions in a calendar year |  |  | $ 25,000 |
Share-based compensation | $ 1,135,000 | $ 1,062,000 | $ 3,568,000 | $ 2,887,000
Forfeiture rate |  |  | 0.40% |
Unrecognized compensation expense related to stock options | 0 |  | $ 0 |
Aggregate intrinsic value of stock options exercised |  |  | 197,000 | 355,000
Cash receipts of stock options exercised |  |  | $ 83,000 | $ 121,000
Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock option term |  |  | 10 years |
Stock options vesting percentage |  |  | 100.00% |
Stock Options | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vested period |  |  | 1 year |
Stock Options | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vested period |  |  | 2 years |
RSAs |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vested period |  |  | 3 years |
Unrecognized compensation expense related to RSAs | 7,726,000 |  | $ 7,726,000 |
Unrecognized compensation expense expected recognition period |  |  | 1 year 10 months 28 days |
ESPP |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized compensation expense related to stock options | 0 |  | $ 0 |
Grant date fair value of ESPP options | $ 23,000 |  |  |

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents 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=120381028&loc=d3e5070-113901 + Details
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