Basis of Presentation and Significant Accounting Policies - Non-Cash Investing and Financing Activities and Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands		12 Months Ended
	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Non-cash investing and financing activities:
Capital expenditures financed by accounts payable		$ 31	$ 27
Reclassification to equity of interest paid in kind attributable to conversion option, net of tax effect (Note 5)		788	3,547
Reclassification of debt conversion option from debt to equity, net (Note 5)	$ 36,952	36,952	0
Cash paid during the period for:
Interest		4,476	7,075
Income taxes		912	1,647
Cash received during the period for:
Income tax refunds		$ 2,201	$ 952