CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Allowance for doubtful accounts	$ 2,025	$ 2,232
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)	53,054,960	51,839,527
Common stock, shares outstanding (in shares)	52,393,579	51,178,146
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 (in shares)	661,381	661,381
Treasury Stock
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Series B Convertible Stock
Preferred stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized (in shares)	150,000	0
Preferred stock, shares outstanding (in shares)	150,000	0