CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Allowance for doubtful accounts	$ 2,749,000	$ 2,399,000
Aggregate principal amount	$ 108,792,000	$ 181,580,000
Redeemable preferred stock par value (in dollars per share)	$ 0.01
Redeemable preferred stock, shares authorized (in shares)	1,000,000
Redeemable preferred stock, shares issued (in shares)	85,412
Redeemable preferred stock, shares outstanding (in shares)	85,412	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	89,428,513	21,754,223
Common stock, shares outstanding (in shares)	89,428,513	21,754,223
Convertible Notes Payable | 2023 Series D Convertible Notes
Aggregate principal amount	$ 0	$ 50,323,000
Convertible Notes Payable | 2023 Series D Convertible Notes
Aggregate principal amount	277,000	3,352,000
Revolving Credit Facility | Line of Credit
Aggregate principal amount	25,000,000	25,000
Term Loan | Senior Notes, due February 2023
Aggregate principal amount	$ 83,515,000	$ 102,905,000