Segments - Reconciliation of Net Loss Before Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Segment Reporting Information [Line Items]
Segment Adjusted EBITDA for reportable segments	$ (17,963)	$ (19,202)	$ (39,239)	$ (36,521)
Other expenses:
Depreciation and amortization			(3,404)	(6,518)
Gain (loss) on disposals of assets			40	(360)
Stock-based compensation expense	(2,188)	(2,309)	(5,320)	(5,871)
Equity in net loss of affiliates			0	(1)
Other			(1)	(105)
Shares issued as payment for services			545	576
Consolidated net loss from continuing operations before income taxes	(20,384)	(26,148)	(43,173)	(50,104)
Operating segments
Segment Reporting Information [Line Items]
Remove cash paid for capital expenditures, net of proceeds from sale of assets, and cash paid for investments in affiliates	101	172	255	668
Interest income	828	37	1,461	75
Corporate And Reconciling Items
Other expenses:
Interest expense	(136)	(2,063)	(460)	(4,101)
Depreciation and amortization	(1,693)	(1,835)	(3,404)	(3,753)
Gain (loss) on disposals of assets	40	0	40	0
Impairment losses	0	(638)	0	(1,120)
Stock-based compensation expense	(2,188)	(2,279)	(5,320)	(5,803)
Adjustment related to accrued bonuses paid in equity awards	0	0	3,361	1,698
Equity in net loss of affiliates	0	0	0	(1)
Other	0	(105)	0	(105)
Shares issued as payment for services	0	0	(545)	(576)
Corporate noncash items	627	(203)	678	(468)
Eliminations
Other expenses:
Consolidated net loss from continuing operations before income taxes	0	(32)	0	(97)
Segment Adjusted EBITDA for reportable segments
Segment Reporting Information [Line Items]
Segment Adjusted EBITDA for reportable segments	(17,963)	(19,202)	(39,239)	(36,521)
All Other Segment Adjusted EBITDA
Segment Reporting Information [Line Items]
Segment Adjusted EBITDA for reportable segments	$ 0	$ 0	$ 0	$ 0