Summary of Significant Accounting Policies - Stockholder's Equity (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Nov. 01, 2018
Accounting Policies [Abstract]
Authorized amount from Board of Directors for share repurchase		$ 50,000,000
Number of shares repurchased	361,442
Cost of shares repurchased	$ 11,000,000.0	$ 3,000,000.0
Remaining authorized repurchase amount	$ 36,000,000.0
Common stock, shares authorized	200,000,000	200,000,000	200,000,000
Common stock, par value (in dollars per share)	$ 0.01		$ 0.01