Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash flows from operating activities
Net loss	$ (22,893)	$ (25,735)
Adjustments to reconcile net loss to net cash used in operating activities:
Non-cash other income (expense), net	3	73
Non-cash interest income	(4)
Non-cash interest expense	222	249
Depreciation and amortization expense	155	188
Amortization of right-of-use assets		281
Stock-based compensation	1,334	1,738
Other, net	(112)	16
Changes in operating assets and liabilities:
(Increase) decrease in other non-current assets	2	(10)
Increase in accounts receivable, net and other receivables and prepaid expenses	(692)	(13,382)
Increase in inventory	(1,026)	(4,290)
Decrease in accounts payable	(3,265)	(1,249)
Increase (decrease) in accrued expenses and other liabilities	(2,155)	1,630
Decrease in deferred revenue	(374)	(187)
Decrease in other non-current liabilities	(104)	(192)
Increase in income tax liabilities		670
Net cash used in operating activities	(28,909)	(40,200)
Cash flows from investing activities
Purchases of equipment and intangible assets	(99)	(18)
Changes in restricted cash	(53)	(51)
Net cash used in investing activities	(152)	(69)
Cash flows from financing activities
Proceeds from issuance of common stock and warrants	2,046	25,462
Proceeds from at-the-market facility	993	37,970
Repayments of unexercised warrant nominal values	(406)
Repayments of long-term borrowings	(949)
Equity transaction costs	(282)	(3,276)
Net cash provided by financing activities	1,402	60,156
Effects of exchange rate changes on the balance of cash held in foreign currencies	(12)	(157)
Net increase/(decrease) in cash, cash equivalents and restricted cash	(27,671)	19,730
Cash, cash equivalents, and restricted cash at beginning of period	47,834	41,590
Cash, cash equivalents and restricted cash at end of period	20,163	61,320
Supplemental disclosure of cash flow information:
Interest paid	240	248
Taxes paid	853
Equity transaction costs included in accounts payable and accrued expenses	$ 639	$ 806