CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Operating activities
Net loss	$ (20,679)	$ (32,818)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	1,627	1,571
Stock-based compensation	11,433	11,141
Non-cash operating lease cost	704	706
Changes in valuation of warrant investment	236	(402)
Net loss on sale of available-for-sale securities	91
Unrealized gain on investments	(587)	(249)
Impairment of long-lived assets	542
Non-cash interest expense	921	481
Foreign currency remeasurement loss	571	197
Changes in operating assets and liabilities:
Accounts receivable	(1,844)	(2,134)
Inventories	(2,722)	(8,006)
Prepaid and other assets	1,677	(2,580)
Accounts payable	(6,013)	7,389
Accrued liabilities and other non-current liabilities	(8,060)	(1,708)
Deferred product revenue	302	294
Net cash used in operating activities	(21,801)	(26,118)
Investing activities
Capital expenditures	(191)	(225)
Purchases of investments	(13,216)	(2,026)
Proceeds from maturities and sale of investments	16,554	33,500
Net cash provided by investing activities	3,147	31,249
Financing activities
Net proceeds from equity incentives	2,512	2,094
Offering costs from public offerings	(94)	(292)
Net proceeds on revolving line of credit	233	813
Proceeds from loans		15,000
Net cash provided by financing activities	2,651	17,615
Effect of exchange rates on cash, cash equivalents, and restricted cash	(718)	(363)
Net (decrease) increase in cash, cash equivalents and restricted cash	(16,721)	22,383
Cash, cash equivalents and restricted cash, beginning of period	51,044	38,903
Cash, cash equivalents and restricted cash, end of period	$ 34,323	$ 61,286