Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash flows from operating activities
Net (loss) income	$ (95,904)	$ 28,317	$ (92,166)
Adjustments to reconcile net (loss) income to net cash used in operating activities:
Depreciation and amortization	6,668	10,765	13,761
(Loss) Gain on disposals of assets, net	(72)	421	150
Impairment of goodwill	10,390	482	0
Impairment of other noncurrent assets	445	638	543
Disposal Group, Including Discontinued Operation, Gain (Loss) on Disposal	0	(94,702)	0
Gain on debt retirement	(60)	(961)	0
Amortization of premiums (discounts) on investments, net	(1,809)	832	1,232
Equity in net (income) loss of affiliates	0	(862)	3
Stock-based compensation expense	9,888	10,206	13,904
Shares issued as payment for services	545	575	577
Provision for credit losses	0	944	1,268
Accretion of debt discount and amortization of deferred financing costs	60	1,042	11,735
Deferred income taxes	(479)	(150)	(167)
Noncash gain on termination of leases	0	0	(5,831)
Other noncash items	2	107	24
Receivables:
Trade	76	(2,175)	(6,230)
Other	12,153	(11,338)	(330)
Prepaid expenses and other	748	2,630	(1,383)
Other assets	129	(101)	305
Accounts payable	(2,421)	379	420
Accrued compensation and benefits	5,227	(37)	2,853
Other accrued liabilities	782	(1,517)	1,858
Deferred revenue	484	(23,396)	1,656
Lease liabilities	(107)	(107)	97
Other long-term liabilities	0	(37)	(50)
Settlement and Indemnification Accruals	(13,675)	13,000	0
Net cash used in operating activities	(66,930)	(65,045)	(55,771)
Cash flows from investing activities
Purchases of investments	(185,026)	0	(174,221)
Sales and maturities of investments	183,377	68,441	100,168
Purchases of property, plant and equipment	(1,536)	(4,924)	(7,247)
Proceeds from sale of assets	98	594	3,006
Proceeds from sale of discontinued operations	0	162,306	0
Proceeds from repayment of notes receivable	0	0	3,754
Net cash (used in) provided by investing activities	(3,087)	226,417	(74,540)
Cash flows from financing activities
Proceeds from issuance of common stock , net of issuance costs	72,808	0	121,045
Payments of long-term debt, including cost to retire of $120 and $588 in 2023 and 2022, respectively	(43,219)	(155,293)	(466)
Proceeds from stock option exercises	0	1	608
Net cash provided by (used in) financing activities	29,589	(155,292)	121,187
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	(320)	(827)	217
Net (decrease) increase in cash, cash equivalents, and restricted cash	(40,748)	5,253	(8,907)
Cash, cash equivalents, and restricted cash
Beginning of year	48,596	43,343	52,250
End of year	7,848	48,596	43,343
Supplemental disclosure of cash flow information
Cash paid during the period for interest	1,171	8,535	7,155
Cash paid during the period for income taxes	21	0	36
Significant noncash activities
Accrued compensation paid in equity awards	3,361	1,698	0
Purchases of property and equipment included in accounts payable and other accrued liabilities	566	40	820
Proceeds from sale of assets included in receivables	$ 0	$ 0	$ 14