Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2022	Jun. 30, 2022	Sep. 30, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities:
Net loss	$ (10,385)	$ (15,553)	$ (21,481)	$ (25,412)	$ (71,067)	$ (51,853)
Adjustments to reconcile net loss to net cash used in operating activities:
Noncash inventory reserve					5,323
Depreciation	527	1,057	1,255	1,280	2,064	105
Amortization	61	124	188	254	159	171
Loss on disposition of assets			11,122	11,122
Noncash stock-based compensation	764	1,433	1,969	2,493	3,338	2,818
Noncash amortization of deferred financing costs	419	797	1,635	1,969	1,661	1,341
Unrealized gain on warrants	(1,384)	(8,435)	(22,171)	(25,520)	(3,827)
Changes in operating assets and liabilities:
Accounts receivable	(132)	(554)	(2,178)	(1,844)	(668)	(865)
Income taxes receivable	(4,675)
Inventory	(1,727)	(1,374)	(831)	(366)	(6,289)
Prepaid expenses and other assets	707	1,267	(1,551)	880	(967)	(2,485)
Accounts payable and accrued expenses	1,095	3,643	(2,213)	(628)	5,202	3,641
Lease liability	(21)	(90)	(132)	(175)	(131)	(184)
Net cash used in operating activities	(14,751)	(17,685)	(34,388)	(35,947)	(65,202)	(47,311)
Cash flows from investing activities:
Purchases of marketable securities						(54,837)
Sales and maturities of marketable securities					39,729	14,500
Acquisition of property and equipment	(126)	(133)	(133)	(133)	(269)	(353)
Net cash (used in) provided by investing activities	(126)	(133)	(133)	(133)	39,460	(40,690)
Cash flows from financing activities:
Proceeds from issuance of common stock in public offering, net of offering costs			21,971	21,936	21,081	48,434
Proceeds from issuance of long-term debt						20,000
Repayments of long-term debt	(5,000)	(5,000)	(17,150)	(17,375)
Debt financing costs paid						(1,059)
Proceeds from exercise of stock options					75	610
Net cash provided by financing activities	(523)	11,702	21,523	22,183	30,422	67,985
Net (decrease) increase in cash and cash equivalents	(15,400)	(6,116)	(12,998)	(13,897)	4,680	(20,016)
Cash and cash equivalents, beginning of period	19,143	19,143	19,143	19,143	14,463	34,479
Cash and cash equivalents, end of period	3,743	13,027	6,145	5,246	19,143	14,463
Supplemental disclosure of noncash financing activities
Warrants issued in connection with long-term debt					1,080	3,570
Operating right-of-use assets obtained in exchange for new operating lease liabilities					969
Supplemental cash flow information
Interest paid	452	898	1,078	1,162	2,383	$ 2,099
Public offering
Cash flows from financing activities:
Proceeds from issuance of preferred stock in registered direct offering, net of offering costs	4,129	4,129	4,129	4,128
At-the-market sales
Cash flows from financing activities:
Proceeds from At-the-Market sales of common stock, net of offering costs	$ 348	$ 12,573	$ 12,573	$ 13,494	$ 9,266