CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Operating activities
Net loss	$ (12,284)	$ (17,457)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	865	794
Stock-based compensation	6,426	5,333
Non-cash operating lease cost	396	321
Changes in valuation of warrant investment	281	(220)
Net loss on sale of available-for-sale securities	26
Unrealized gain on investments	(820)	(208)
Impairment of long-lived assets	542
Non-cash interest expense	464	104
Foreign currency remeasurement loss	287	206
Changes in operating assets and liabilities:
Accounts receivable	(564)	2,465
Inventories	(834)	(1,036)
Other assets	(4,111)	(2,693)
Accounts payable	(4,121)	(833)
Accrued liabilities and other non-current liabilities	(8,594)	(4,710)
Deferred product revenue	585	479
Net cash used in operating activities	(21,456)	(17,455)
Investing activities
Capital expenditures	(113)	(193)
Purchases of investments	(642)	(1,915)
Proceeds from maturities and sale of investments	9,377	23,500
Net cash provided by investing activities	8,622	21,392
Financing activities
Net proceeds from equity incentives	2,135	1,066
Net proceeds on revolving line of credit	314	1,422
Proceeds from loans		15,000
Net cash provided by financing activities	2,449	17,488
Effect of exchange rates on cash, cash equivalents, and restricted cash	(284)	(521)
Net (decrease) increase in cash, cash equivalents and restricted cash	(10,669)	20,904
Cash, cash equivalents and restricted cash, beginning of period	51,044	38,903
Cash, cash equivalents and restricted cash, end of period	$ 40,375	$ 59,807