Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash flows from operating activities:
Net loss from continuing operations	$ (30,469)	$ (24,219)
Net gain (loss) from discontinued operations	12,537	(1,384)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	872	1,259
Stock-based compensation expense	1,874	2,234
Amortization of debt discount	643	779
Change in fair value of contingent consideration	71
Loss on disposal of assets and impairment charges	78
Loss on partial extinguishment of debt	3,501
Deferred income taxes		2
Changes in operating assets and liabilities, net of effect of acquisition:
Receivables, net	(2,968)	3,414
Prepaid expenses and other assets	(596)	(2,234)
Inventories	(6,568)	2,523
Accounts payable and accrued expenses	15,096	(13,446)
Net cash used in operating activities of continuing operations	(18,466)	(29,688)
Cash flows from investing activities:
Purchase of property and equipment	(190)	(1,732)
Payments for licenses		(1,088)
Proceeds from the sale of property and equipment	23
Purchases of short-term investments	(9,488)	(55,784)
Sales and maturities of short-term investments	9,488	71,250
Net cash (used in) provided by investing activities of continuing operations	(167)	12,646
Cash flows from financing activities:
Proceeds from sale of stock	1,695
Proceeds from exercise of stock options		852
Costs incurred related to the prepayment of debt	(2,025)
Repayment of finance lease obligations and long-term debt	(25,039)	(56)
Net cash (used in) provided by financing activities of continuing operations	(25,369)	796
Net decrease in cash, cash equivalents, and restricted cash from continuing operations	(44,002)	(16,246)
Net cash used in operating activities of discontinued operations	(5,423)	(188)
Net cash provided by (used in) investing activities of discontinued operations	38,050	(5,609)
Net cash used in financing activities of discontinued operations	(7)	(42)
Net increase (decrease) in cash and cash equivalents from discontinued operations	32,620	(5,839)
Cash, cash equivalents, and restricted cash, beginning of period	51,702	86,087
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	654	478
Cash, cash equivalents, and restricted cash, end of period (See Note 5)	40,974	64,480
Supplemental cash flow disclosures
Interest paid	3,790	7,708
Non-cash investing and financing activities:
Accrued purchases of property and equipment from continuing operations	922	1,191
Accrued purchases of property and equipment from discontinued operations		27
Accrued purchases of licenses	1,418	$ 1,800
ROU assets derecognized from modification of operating lease obligations	(128)
ROU assets recognized in exchange for operating lease obligations	$ 78