CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 9	$ 9
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, authorized	24,088	24,088
Preferred stock, issued	0	0
Preferred stock, outstanding	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized	55,000,000	55,000,000
Common stock, issued	38,221,292	38,136,792
Common stock, outstanding	38,221,292	38,136,792