CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Current assets:
Allowance for doubtful accounts	$ 1,653	$ 1,456
Stockholders' deficit:
Commons stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	46,408,000	45,828,000
Common stock, shares outstanding	44,620,000	44,954,000