Description of the Business (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Sep. 28, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Class of Warrant or Right [Line Items]
Common shares issued (in shares)	2,530,000
Share price (in dollars per share)	$ 94.46
Proceeds, net of underwriters' fees	$ 227,500	$ 0	$ 0	$ 227,476
Underwriters' option
Class of Warrant or Right [Line Items]
Common shares issued (in shares)	330,000