CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Operating activities:
Net loss	$ (12,515)	$ (16,054)
Adjustments to reconcile net loss to net cash flows from operating activities:
Depreciation and amortization expense	2,329	1,928
Stock-based compensation expense	17,492	20,339
Amortization of premiums and discounts on marketable securities	(504)	302
Amortization of debt issuance costs	108	0
Non-cash lease costs	2,466	2,155
Other	17	16
Changes in operating assets and liabilities:
Inventory	2,103	(2,548)
Accounts receivable	8,220	3,773
Other current assets	(241)	(563)
Accounts payable	956	1,152
Accrued expenses	(2,219)	(1,912)
Operating lease liabilities	(184)	(1,977)
Other non-current assets and liabilities, net	28	0
Net cash provided by operating activities	18,056	6,611
Investing activities:
Purchases of investments	(28,537)	(34,948)
Sales and maturities of investments	42,038	26,344
Expenditures for property and equipment	(5,609)	(5,062)
Purchases of intangible assets	(7,500)	0
Net cash provided by (used in) investing activities	392	(13,666)
Financing activities:
Net proceeds from common stock issuance	3,498	2,211
Payments on employee’s behalf for taxes related to vesting of restricted stock unit awards	(2,176)	(1,441)
Other	(20)	(18)
Net cash provided by financing activities	1,302	752
Net increase (decrease) in cash, cash equivalents, and restricted cash	19,750	(6,303)
Cash, cash equivalents, and restricted cash at beginning of period	51,067	68,541
Cash, cash equivalents, and restricted cash at end of period	70,817	62,238
Supplemental disclosure of cash flow information:
Right-of-use asset and lease liability recognized	35,976	0
Additions to property and equipment included in accounts payable	4,321	869
Reconciliation of amounts within the condensed consolidated balance sheets:
Cash and cash equivalents	43,023	56,054
Restricted cash	27,794	6,184
Total cash, cash equivalents, and restricted cash at end of period	$ 70,817	$ 62,238