CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Allowance for doubtful accounts	$ 2,286	$ 2,061
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	400,000,000	400,000,000
Common stock, shares issued (in shares)	53,051,476	53,092,328
Common stock, shares outstanding (in shares)	52,390,095	52,430,947
Preferred stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized (in shares)	1	1
Preferred stock, shares outstanding (in shares)	1	1
Treasury Stock
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Treasury stock (in shares)	661,381	661,381
Series B Convertible Stock
Series B convertible preferred stock par value (in dollars per share)	$ 0.0001	$ 0.0001
Series B convertible preferred stock, shares authorized (in shares)	150,000	150,000
Series B convertible preferred stock, shares issued (in shares)	150,000	150,000
Series B convertible preferred stock, shares outstanding (in shares)	145,046	150,000