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Stock-Based Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Stock-Based Compensation |  |  |  |
Weighted average granted date fair value (in dollars per share) |  |  | $ 114.60 |
Allocated share based compensation expense |  |  | $ 690 |
Equity instruments granted (in shares) |  |  | 6,601 |
Compensation expense |  |  | $ 756 |
Unrecognized compensation costs related to unvested share-based compensation arrangements | $ 21,300 |  | $ 21,300 |
Weighted-average period for recognition of unrecognized stock-based compensation expense | 2 years 6 months |  |  |
Restricted Stock Units |  |  |  |
Stock-Based Compensation |  |  |  |
Awarded (in shares) |  |  | 133,717 |
Weighted average granted date fair value (in dollars per share) |  |  | $ 100.93 |
Vesting period |  |  | 3 years |
Employees |  |  |  |
Stock-Based Compensation |  |  |  |
Stock-based compensation expense | $ 3,300 | $ 5,200 | $ 9,800 | $ 5,400
Employees | Restricted Stock Units |  |  |  |
Stock-Based Compensation |  |  |  |
Vesting period |  |  | 4 years |

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- Definition Amount of expense recognized from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments), awarded to key employees or individuals. Excludes amount related to plans that cover generally all employees (for example, but not limited to, qualified pension plans). + References No definition available. + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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