Stockholders' Equity (Restricted Stock) (Details) - Restricted stock units - 2014 Plan - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Stockholders' Equity, other disclosures
Requisite service period, annually			3 years
Stock-based compensation expense	$ 1.1	$ 1.8	$ 2.5	$ 3.7
Unrecognized compensation costs (in dollars)	$ 5.7		$ 5.7
Weighted average period over which unrecognized compensation costs are expected to be recognized			1 year 5 months 26 days
Number of shares
Balance at beginning of the period			708,806
Granted			574,200
Vested			(147,924)
Forfeited			(61,626)
Balance at end of the period	1,073,456		1,073,456
Weighted average grant date fair value
Balance at beginning of the period			$ 43.86
Granted			1.71
Vested			24.91
Forfeited			12.05
Balance at end of the period	$ 25.75		$ 25.75