Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities
Net income (loss)	$ 28,317	$ (92,166)	$ (170,521)
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Depreciation and amortization	10,765	13,761	17,516
Loss on disposals of assets, net	421	150	4,442
Impairment of goodwill	482	0	9,635
Impairment of other noncurrent assets	638	543	13,326
Gain on sale of discontinued operations	(94,702)	0	(672)
Loss on release of cumulative foreign currency translation adjustment	0	0	26,957
Loss on settlement agreement	0	0	11,436
Gain on debt retirement	(961)	0	0
Unrealized and realized depreciation on equity securities and preferred stock, net	0	0	106
Amortization of premiums (discounts) on investments, net	832	1,232	(699)
Equity in net (income) loss of affiliates	(862)	3	1,176
Stock-based compensation expense	10,206	13,904	18,366
Shares issued as payment for services	576	577	1,006
Provision for credit losses	944	1,268	899
Accretion of debt discount and amortization of deferred financing costs	1,042	11,735	10,587
Deferred income taxes	(150)	(167)	(156)
Noncash (gain) loss on termination of leases	0	(5,831)	191
Other noncash items	106	24	35
Receivables:
Trade	(2,229)	(6,176)	2,214
Related parties	54	(54)	258
Other	(11,338)	(330)	1,853
Inventory	2,341	(1,903)	2,511
Prepaid expenses and other	289	520	(812)
Other assets	(101)	305	(142)
Accounts payable	379	420	(1,097)
Accrued compensation and benefits	(37)	2,853	(789)
Other accrued liabilities	11,561	1,850	(2,682)
Deferred revenue	(23,396)	1,656	(21,045)
Lease liabilities	(107)	97	(887)
Related party payables	(78)	8	(33)
Other long-term liabilities	(37)	(50)	0
Net cash used in operating activities	(65,045)	(55,771)	(77,021)
Cash flows from investing activities
Purchases of investments	0	(174,221)	(171,360)
Sales and maturities of investments	68,441	100,168	133,000
Purchases of property, plant and equipment	(4,924)	(7,247)	(7,527)
Proceeds from sale of assets	594	3,006	6,484
Proceeds from sale of discontinued operations	162,306	0	64,240
Proceeds from repayment of notes receivable	0	3,754	2,942
Net cash provided by (used in) investing activities	226,417	(74,540)	27,779
Cash flows from financing activities
Proceeds from issuance of shares and warrants, net of issuance costs	0	121,045	35,000
Advances from lines of credit	0	0	10,005
Repayments of advances from lines of credit	0	0	(11,927)
Payments of long-term debt	(154,705)	(466)	(490)
Payments of cost to retire long-term debt	(588)	0	0
Proceeds from stock option and warrant exercises	1	608	117
Payment of stock issuance costs	0	0	0
Net cash (used in) provided by financing activities	(155,292)	121,187	32,705
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	(827)	217	353
Net increase (decrease) in cash, cash equivalents, and restricted cash	5,253	(8,907)	(16,184)
Cash, cash equivalents, and restricted cash
Beginning of year	43,343	52,250	68,434
End of year	48,596	43,343	52,250
Supplemental disclosure of cash flow information
Cash paid during the period for interest	8,535	7,155	7,202
Cash paid during the period for income taxes	0	36	48
Significant noncash activities
Fair value of stock issued upon conversion of long-term debt	0	0	56,827
Fair value of stock issued in conjunction with settlement agreement	0	0	18,103
Accrued compensation paid in equity awards	1,698	0	5,100
Purchases of property and equipment included in accounts payable and other accrued liabilities	40	820	277
Proceeds from sale of assets included in receivables	$ 0	$ 14	$ 4,227