CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Restricted cash	$ 243	$ 0
Allowance for doubtful accounts	$ 617	$ 369
Stockholders' equity:
Preferred Stock, par or stated value per share (in dollars per share)	$ 0.01	$ 0.01
Preferred Stock, shares authorized (in shares)	1,000,000	1,000,000
Preferred Stock, shares issued (in shares)	0	0
Common Stock, par or stated value per share (in dollars per share)	$ 0.01	$ 0.01
Common Stock, shares authorized (in shares)	30,000,000	30,000,000
Common Stock, shares issued (in shares)	12,037,966	11,987,572
Treasury stock, shares (in shares)	3,293,223	3,434,231