Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 37,765	$ 36,043
Accounts receivable	2,112	2,152
Prepaid expenses and other current assets	1,760	2,937
Total current assets	41,637	41,132
Property and equipment, net	1,198	1,969
Operating lease right-of-use assets	1,175	1,889
Restricted cash	688	688
Other assets	373	402
Total assets	45,071	46,080
Current liabilities:
Accounts payable	173	525
Accrued and other liabilities	3,644	4,126
Lease liabilities, current portion	2,166	2,497
Total current liabilities	5,983	7,148
Lease liabilities, noncurrent portion	0	882
Warrant liabilities	33,026	115
Total liabilities	39,009	8,145
Commitments and contingencies (Note 8)
Stockholders’ equity:
Preferred stock, $0.0001 par value, 10,000 shares authorized; no shares issued and outstanding as of June 30, 2024 and December 31, 2023	0	0
Common stock, $0.0001 par value, 500,000 shares authorized as of June 30, 2024 and December 31, 2023; 3,206 and 2,063 shares issued and outstanding as of June 30, 2024 and December 31, 2023, respectively	0	0
Additional paid-in-capital	261,848	259,630
Accumulated deficit	(255,786)	(221,695)
Total stockholders' equity	6,062	37,935
Total liabilities and stockholders’ equity	$ 45,071	$ 46,080