Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash flows from operating activities
Net Income (Loss) Attributable to Parent	$ (19,251)	$ (17,318)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	3,292	3,523
Loss (gain) on disposals of assets, net	125	(343)
Impairment of goodwill	482	0
Amortization of premiums on investments, net	265	57
Equity in net loss of affiliates	1	3
Stock-based compensation expense	3,562	5,415
Shares issued as payment for services	576	577
Provision for credit losses	334	162
Accretion of debt discount and amortization of deferred financing costs	284	2,751
Deferred income taxes	(58)	(56)
Noncash gain on termination of operating leases	0	(4,602)
Other noncash items	0	1
Receivables:
Trade	(3,696)	(4,949)
Related parties	58	7
Other	21	(279)
Inventory	531	721
Prepaid expenses and other	1,571	844
Other assets	42	95
Accounts payable	(588)	(189)
Accrued compensation and benefits	(3,462)	(1,893)
Other accrued liabilities	(1,086)	(2,216)
Deferred revenue	(1,767)	1,054
Lease liabilities	(18)	218
Related party payables	(1)	33
Net cash used in operating activities	(18,783)	(16,384)
Cash flows from investing activities
Purchases of investments	0	(174,221)
Sales and maturities of investments	18,000	40,500
Purchases of property, plant and equipment	(1,579)	(1,014)
Proceeds from sale of assets	147	1,944
Proceeds from repayment of notes receivable	0	3,689
Net cash provided by (used in) investing activities	16,568	(129,102)
Cash flows from financing activities
Proceeds from issuance of shares, net of issuance costs	0	121,045
Payments of long-term debt	(164)	(116)
Proceeds from stock option exercises	1	111
Net cash (used in) provided by financing activities	(163)	121,040
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	(230)	(11)
Net decrease in cash, cash equivalents, and restricted cash	(2,608)	(24,457)
Cash, cash equivalents, and restricted cash
Beginning of period	43,343	52,250
End of period	40,735	27,793
Supplemental disclosure of cash flow information
Cash paid during the period for interest	3,535	3,539
Cash paid during the period for income taxes	0	4
Significant noncash activities
Accrued compensation paid in equity awards	1,698	0
Purchases of property and equipment included in accounts payable and other accrued liabilities	251	255
Proceeds from sale of assets included in accounts receivable	132	23
Cash, cash equivalents, and restricted cash
Cash and cash equivalents	40,321
Restricted cash included in other assets	414
Cash, cash equivalents, and restricted cash	$ 40,735	$ 27,793