Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 5,246	$ 6,145	$ 13,027	$ 3,743	$ 19,143
Accounts receivable, net	3,377	3,711	2,087	1,665	1,533
Inventory, net	1,332	1,797	2,340	2,693	966
Prepaid expenses and other current assets	1,403	3,834	1,016	1,576	2,283
Total current assets	11,358	15,487	18,470	14,352	23,925
Property and equipment, net	177	203	11,524	12,047	12,447
Right of use asset	695	761	825	888	949
Other non-current assets	2,012	2,012	2,012	2,012	2,012
Total assets	14,242	18,463	32,831	29,299	39,333
Current liabilities:
Long-term debt, current portion	1,426	1,318	12,630	12,252	16,833
Accounts payable	7,734	4,906	12,036	9,537	8,707
Accrued expenses	3,908	5,152	3,877	3,828	3,563
Lease liability, current portion	319	277	239	231	175
Total current liabilities	13,387	11,653	28,782	25,848	29,278
Lease liabilities, long-term	466	550	630	708	784
Warrant liability	5,934	9,285	1,050	8,101	5,356
Total liabilities	19,787	21,488	30,462	34,657	35,418
Commitments and contingencies (Note 13)
Stockholders' equity
Preferred stock, $.0001 par value, 10,000,000 shares authorized, 4,850 issued and no shares outstanding at December 31, 2022 and no shares issued and outstanding at December 31, 2021
Common stock, $.0001 par value, 300,000,000 shares authorized, 42,970,134 and 3,034,901 issued and outstanding at December 31, 2022 and December 31, 2021, respectively	4	4	1
Additional paid-in capital	403,153	401,744	401,211	388,317	387,205
Accumulated deficit	(408,702)	(404,773)	(398,843)	(393,675)	(383,290)
Total stockholders' equity	(5,545)	(3,025)	2,369	(5,358)	3,915	$ 49,328	$ 45,745
Total liabilities and stockholders' equity	$ 14,242	$ 18,463	$ 32,831	$ 29,299	$ 39,333