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Stock-Based Compensation - Narrative (Details) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 USD ($) $ / shares shares | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) director $ / shares shares | Jun. 30, 2019 USD ($)
Stock-Based Compensation |  |  |  |
Unrecognized compensation costs related to unvested share-based compensation arrangements | $ 14,200 |  | $ 14,200 |
Weighted-average period for recognition of unrecognized stock-based compensation expense | 2 years 7 months 6 days |  |  |
Restricted Stock Units |  |  |  |
Stock-Based Compensation |  |  |  |
Stock-based compensation expense | $ 543 |  |  |
Awarded (in shares) | shares |  |  | 166,951 |
Weighted average granted date fair value (in dollars per share) | $ / shares | $ 58.72 |  | $ 74.91 |
Vesting period |  |  | 3 years |
Share-based Goods and Nonemployee Services Transaction, Quantity of Securities Issued | shares | 9,239 |  |  |
Weighted average exercise price (in dollars per share) | $ / shares | $ 74.66 |  |  |
Employees |  |  |  |
Stock-Based Compensation |  |  |  |
Stock-based compensation expense | $ 5,200 | $ 2,500 | $ 5,400 | $ 6,600
Employees | Restricted Stock Units |  |  |  |
Stock-Based Compensation |  |  |  |
Vesting period |  |  | 4 years |
Director [Member] | Restricted Stock Units |  |  |  |
Stock-Based Compensation |  |  |  |
Number Of Directors | director |  |  | 7 |
Share-based Goods and Nonemployee Services Transaction, Stockholders' Equity | $ 690 |  |  |

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