CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	200,000,000	200,000,000
Common stock, shares issued (in shares)	18,929,496	18,929,496
Common stock, shares outstanding (in shares)	16,612,294	16,558,759
Treasury stock, shares at cost (in shares)	2,377,558	2,370,737
Series B Redeemable Convertible Preferred Stock
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	100,000,000	100,000,000
Preferred stock, shares issued (in shares)	12,427,941	12,427,941
Preferred stock, shares outstanding (in shares)	12,427,941	12,427,941
Preferred stock, liquidation preference	$ 59,870	$ 59,870
Series A Redeemable Preferred Stock
Preferred stock, shares issued (in shares)	22,000	22,000
Preferred stock, shares outstanding (in shares)	22,000	22,000
Preferred stock, liquidation preference	$ 22,000	$ 22,000