Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Current assets
Cash and cash equivalents	$ 71,061	$ 74,268
Short-term investments	47,125	1,010
Restricted cash	182	182
Inventory	1,230
Prepaid expenses	2,282	2,791
Deposits and other current assets	1,428	24
Total current assets	123,308	78,275
Property and equipment, net	54	69
Right-of-use lease assets - operating, net	566	410
Deposits and other assets	267	283
Total assets	124,195	79,037
Current liabilities
Accounts payable	1,518	544
Accrued expenses	5,289	3,995
Term loan, short-term		9,805
Lease obligation - operating, short-term	567	476
Other current liabilities	42	26
Total current liabilities	7,416	14,846
Term loan, long-term	36,794	7,354
Derivative liability	7,517
Lease obligation - operating, long-term	7
Other liabilities	28	367
Total liabilities	51,762	22,567
Commitments and contingencies (Note 13)
Stockholders’ Equity
Preferred stock, $0.0001 par value; 10,000,000 shares authorized and no shares issued and outstanding
Common stock; $0.0001 par value; 150,000,000 shares authorized at December 31, 2022; 27,325,959 and 27,366,707 and 34,257,916 shares issued and outstanding at December 31, 2021 and December 31, 2022, respectively	3	3
Additional paid-in capital	298,934	246,166
Accumulated deficit	(226,536)	(189,698)
Accumulated other comprehensive (loss) income	32	(1)
Total stockholders’ equity	72,433	56,470
Total liabilities and stockholders’ equity	$ 124,195	$ 79,037