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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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