CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities:
Net loss	$ (36,231)	$ (44,215)	$ (28,748)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization expense	3,478	1,817	1,577
Stock-based compensation expense	10,321	6,878	2,414
Loss on extinguishment of debt	575
Loss on sale of marketable securities	107
Non-cash interest and end of term accretion expense	465	540	511
Non-cash lease expense	717	829
Net amortization of premiums on marketable securities	381	1,356	634
Unrealized foreign currency transaction (gains) losses	1,129	928	(1,065)
Changes in operating assets and liabilities:
Accounts receivable	(21,678)	840	(218)
Inventory	(8,024)	(4,894)	(1,740)
Prepaid expenses and other current assets	2,521	(3,151)	(769)
Accounts payable	(3,270)	5,090	(5,802)
Accrued expenses and other current liabilities	3,437	4,875	1,948
Deferred revenue		7	60
Operating lease liabilities	255	236
Deferred rent			933
Net cash used in operating activities	(45,817)	(28,864)	(30,265)
Cash flows from investing activities:
Purchases of property and equipment	(11,907)	(3,519)	(455)
Purchases of marketable securities	(10,496)	(72,024)	(121,793)
Proceeds from sales and maturities of marketable securities	76,916	104,810	80,650
Net cash provided by (used) in investing activities	54,513	29,267	(41,598)
Cash flows from financing activities:
Proceeds from issuance of long-term debt, net of issuance costs	58,509
Repayments of long-term debt	(36,050)
Proceeds from issuance of common stock in public offering, net of underwriting discounts and commissions and issuance costs paid	139,854		74,965
Proceeds from issuance of common stock upon exercise of stock options	4,667	974	227
Proceeds from issuance of warrants	438
Proceeds from issuance of common stock in connection with employee stock purchase plan	509	419	357
Proceeds from Paycheck Protection Program loan			2,249
Repayment of Paycheck Protection Program loan			(2,249)
Net cash provided by financing activities	167,927	1,393	75,549
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(1,021)	(797)	803
Net increase in cash, cash equivalents and restricted cash	175,602	999	4,489
Cash, cash equivalents and restricted cash, beginning of period	26,080	25,081	20,592
Cash, cash equivalents and restricted cash, end of period	201,682	26,080	25,081
Supplemental disclosure of cash flow information:
Cash paid for interest	3,260	3,334	3,475
Supplemental disclosure of non-cash investing and financing activities:
Transfers of inventory to property and equipment	2,135	1,823	1,191
Purchases of property and equipment included in accounts payable and accrued expenses	62	1,200
Reconciliation of cash, cash equivalents and restricted cash:
Cash and cash equivalents	201,182	25,580	24,581
Restricted cash	500	500	500
Total cash, cash equivalents and restricted cash shown in the statement of cash flows	$ 201,682	$ 26,080	$ 25,081