Condensed Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Current Assets
Cash and cash equivalents	$ 11,128	$ 15,045
Accounts receivable, net	17	21
Inventories	43	986
Prepaid expenses and other current assets	1,144	1,037
Total current assets	12,332	17,089
Property and equipment, net	38	1,809
Operating lease right-of-use assets	1,967	2,110
Other long-term assets	36	36
TOTAL ASSETS	14,373	21,044
Current Liabilities
Accounts payable	487	988
Accrued expenses	1,970	4,119
Current portion of operating lease liability	297	283
Total current liabilities	2,754	5,390
Operating lease liability	1,828	1,981
Total liabilities	4,582	7,371
Commitments and contingencies (Notes 12-14)
Stockholders’ Equity
Preferred stock, $0.0001 par value; 10,000 shares authorized; no shares issued
Common stock, $0.0001 par value; 300,000 shares authorized; 32,279 and 7,010 shares issued and outstanding as of June 30, 2022 and December 31, 2021, respectively	10	8
Additional paid-in capital	201,996	191,937
Accumulated deficit	(192,215)	(178,272)
Total stockholders’ equity	9,791	13,673
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 14,373	$ 21,044