Condensed Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Current assets:
Cash and cash equivalents	$ 22,026	$ 25,778
Short-term investments	0	995
Accounts receivable	0	6
Interest receivable	63	73
Prepaid expenses and other current assets	659	240
Total current assets	22,748	27,092
Property and equipment, net	50	59
Long-term prepaid maintenance and supplies	30	91
Security deposit	14	14
Operating lease right-of-use asset	155	280
Financing lease right-of-use-asset	1,087	1,588
Total assets	24,084	29,124
Current liabilities:
Accounts payable	665	492
Accrued expenses	207	239
Accrued payroll-related expenses	649	1,328
Current operating lease liability	124	260
Current financing lease liability	1,148	1,253
Deferred revenue	0	4
Total current liabilities	2,793	3,576
Long-term operating lease liability	0	22
Long-term financing lease liability	0	449
Total liabilities	2,793	4,047
Commitments and contingencies (see Note 9)
Stockholders’ equity:
Preferred stock $0.001 par value, authorized 2,500 shares; none issued and outstanding as of June 30, 2025 and December 31, 2024	0	0
Common stock: $0.001 par value, authorized 47,500 shares; 31,090 shares issued and outstanding as of June 30, 2025; and 30,540 shares issued and outstanding as of December 31, 2024	31	31
Additional paid in capital	252,956	246,565
Other comprehensive income	0	1
Accumulated deficit	(231,696)	(221,520)
Total stockholders’ equity	21,291	25,077
Total liabilities and stockholders’ equity	$ 24,084	$ 29,124