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	$ (55,010)	$ (49,811)	$ (47,365)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization expense	2,127	1,032	789
Stock-based compensation expense	25,023	14,612	7,226
Amortization of premiums (accretion of discounts) on investments, net	(1,419)	577	304
Amortization of debt discount and debt issuance costs	218	158	66
Amortization of right-of-use asset	1,041	887	602
Non-cash interest expense	1,037		241
Loss on extinguishment of debt	245		1,119
Loss on disposal of property and equipment	180	9	52
Change in provision for doubtful accounts receivable	(3)	6	(32)
Provision for excess and obsolete inventories	6	77	117
Changes in assets and liabilities:
Accounts receivable	(6,172)	(2,769)	(437)
Inventories	(1,447)	(5,563)	(2,161)
Prepaid expenses and other current assets	(525)	(772)	250
Other assets	(27)	(117)	210
Accounts payable	967	(1,159)	592
Accrued liabilities	1,868	4,418	146
Other liabilities	(690)	(520)	26
Repayment of interest paid in kind			(3,813)
Net cash used in operating activities	(32,581)	(38,935)	(42,068)
Cash flows from investing activities
Purchases of property and equipment	(5,005)	(4,758)	(842)
Proceeds from sale of property and equipment		2
Purchases of investments	(168,163)		(79,906)
Proceeds from maturity of investments	11,100	77,400	71,355
Net cash provided by (used in) investing activities	(162,068)	72,644	(9,393)
Cash flows from financing activities
Proceeds from public offerings, net of underwriting discount, commissions and offering costs paid	108,992		70,568
Proceeds from long-term debt	73,911		48,506
Proceeds from issuance of common stock	5,796	6,946	5,168
Principal repayment of debt	(49,000)		(40,000)
Payments of prepayment penalty and lender fees			(2,496)
Proceeds from disgorgement of short-swing profits, net		32
Net cash provided by financing activities	139,699	6,978	81,746
Net change in cash, cash equivalents and restricted cash	(54,950)	40,687	30,285
Cash, cash equivalents and restricted cash, beginning of period	110,463	69,776	39,491
Cash, cash equivalents and restricted cash, end of period	55,513	110,463	69,776
Supplemental disclosure of cash flow information
Cash paid for interest	3,843	2,360	7,917
Noncash investing and financing activities:
Accounts payable and accrued liabilities for purchases of property and equipment	117	1,138	108
Unpaid deferred offering costs			$ 25
Right-of-use asset obtained in exchange for lease obligation	$ 903	$ 3,307