Condensed Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Cash flows from operating activities
Net loss	$ (29,944)	$ (32,077)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization expense	1,384	922
Stock-based compensation expense	19,037	11,139
Accretion of discounts on investments, net	(3,362)	(64)
Amortization of debt discount and debt issuance costs	114	91
Amortization of right-of-use asset	552	496
Non-cash interest expense	399	474
Loss on extinguishment of debt		245
Loss on disposal of property and equipment	144	175
Change in accounts receivable allowances	19	(3)
Provision for excess and obsolete inventories	14	(3)
Changes in assets and liabilities:
Accounts receivable	(3,537)	(3,944)
Inventories	213	239
Prepaid expenses and other current assets	(619)	(1,242)
Other assets	(124)	(37)
Accounts payable	2,735	1,076
Accrued liabilities	(2,977)	(2,620)
Other liabilities	(811)	2
Net cash used in operating activities	(16,763)	(25,131)
Cash flows from investing activities
Purchases of property and equipment	(721)	(3,049)
Purchases of investments	(114,131)	(21,173)
Proceeds from maturity of investments	101,800
Net cash used in investing activities	(13,052)	(24,222)
Cash flows from financing activities
Proceeds from issuance of common stock	2,702	1,729
Proceeds from long-term debt		75,000
Principal repayment of debt		(49,000)
Payments of debt issuance costs		(970)
Net cash provided by financing activities	2,702	26,759
Net change in cash, cash equivalents and restricted cash	(27,113)	(22,594)
Cash, cash equivalents and restricted cash, beginning of period	55,513	110,463
Cash, cash equivalents and restricted cash, end of period	28,400	87,869
Supplemental disclosure of cash flow information
Cash paid for interest	2,892	1,087
Noncash investing and financing activities:
Accounts payable and accrued liabilities for purchases of property and equipment	56	105
Right-of-use asset obtained in exchange for lease obligation	$ 2,504	903
Unpaid debt issuance costs		$ 119