CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 81,316	$ 77,909
Short-term investments	28,809	59,220
Grant receivable	226
Prepaid expenses and other current assets	7,323	6,553
Total current assets	117,674	143,682
Property and equipment, net	52	37
Right-of-use asset, net	997	1,171
Restricted cash	241	241
Other assets	4,575	4,587
Total assets	123,539	149,718
Current liabilities:
Accounts payable	7,449	7,184
Accrued expenses	17,384	17,928
Note Payable	911
Deferred liabilities		327
Lease liability, short-term	981	941
Total current liabilities	26,725	26,380
Non-current liabilities:
Long-term debt	40,123	40,086
Lease liability, long-term	270	530
Preferred stock tranche liability	10,200	4,189
Total liabilities	77,318	71,185
Stockholders' equity:
Common stock, $0.0001 par value; 300,000 shares authorized, 25,308 and 25,281 shares issued and outstanding at March 31, 2024 and December 31, 2023, respectively	3	3
Additional paid-in capital	883,816	882,248
Accumulated other comprehensive income	(4)	13
Accumulated deficit	(858,753)	(824,890)
Total stockholders' equity	25,062	57,374
Total liabilities, convertible preferred stock and stockholders' equity	123,539	149,718
Series B Preferred Stock
Convertible Preferred Stock:
Convertible preferred stock	$ 21,159	$ 21,159