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Treasury Stock - Additional Information (Details) - Common Stock - USD ($) $ / shares in Units, $ in Millions					1 Months Ended	12 Months Ended
	Dec. 31, 2020	Sep. 09, 2020	Sep. 09, 2019	Aug. 07, 2018	Aug. 31, 2017	Dec. 31, 2020	Dec. 31, 2019
Share Repurchase Program August 2017
Equity Class Of Treasury Stock [Line Items]
Stock approved for repurchase, value					$ 7.0
Period of stock repurchase program					12 months
Additional period of stock repurchase program				12 months
Share Repurchase Program September 9, 2019
Equity Class Of Treasury Stock [Line Items]
Stock approved for repurchase, value			$ 7.0
Period of stock repurchase program			12 months
Additional period of stock repurchase program		12 months
Share Repurchase Program August 2017 and September 2019
Equity Class Of Treasury Stock [Line Items]
Stock repurchase, shares	534,000					69,000	108,000
Stock repurchase, weighted average price per share	$ 9.86					$ 8.78	$ 11.41
Stock repurchase, cost	$ 5.3					$ 0.6	$ 1.2

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