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Stock-Based Compensation - Narrative (Details) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 3 Months Ended
--- | --- | --- | ---
Feb. 15, 2018 $ / shares | Apr. 30, 2020 USD ($) $ / shares | Mar. 31, 2020 USD ($) director $ / shares shares | Mar. 31, 2019 USD ($)
Stock-Based Compensation |  |  |  |
Stock-based compensation expense |  |  | $ 300 | $ 4,100
Increase (Decrease) Share-based Payment Arrangement, Expense |  |  | 3,800 |
Unrecognized compensation costs related to unvested share-based compensation arrangements |  |  | $ 8,900 |
Weighted-average period for recognition of unrecognized stock-based compensation expense |  |  | 2 years 8 months 12 days |
Restricted Stock Units |  |  |  |
Stock-Based Compensation |  |  |  |
Awarded (in shares) | shares |  |  | 157,712 |
Weighted average granted date fair value (in dollars per share) | $ / shares | $ 75.86 |  | $ 74.66 |
Vesting period | 3 years |  |  |
Share-based Goods and Nonemployee Services Transaction, Quantity of Securities Issued | shares |  |  | 9,239 |
Restricted Stock Units | Subsequent Event |  |  |  |
Stock-Based Compensation |  |  |  |
Stock-based compensation expense |  | $ 543 |  |
Weighted average granted date fair value (in dollars per share) | $ / shares |  | $ 58.72 |  |
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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