Condensed Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 14,484	$ 12,591
Short-term investments	3,804	6,940
Accounts receivable	6	0
Unbilled contracts receivable	0	550
Interest receivable	74	79
Prepaid expenses and other current assets	578	244
Total current assets	18,946	20,404
Property and equipment, net	75	100
Long-term prepaid maintenance and supplies	91	91
Security deposit	14	14
Operating lease right-of-use asset	401	517
Financing lease right-of-use-asset	2,341	2,903
Total assets	21,868	24,029
Current liabilities:
Accounts payable	646	618
Accrued expenses	249	222
Accrued payroll related expenses	594	1,382
Current operating lease liability	256	264
Current financing lease liability	1,386	1,328
Deferred revenue	13	0
Total current liabilities	3,144	3,814
Long-term operating lease liability	137	295
Long-term financing lease liability	1,108	1,750
Total liabilities	4,389	5,859
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, 2024 and December 31, 2023	0	0
Common stock: $0.001 par value, authorized 47,500 shares; 27,622 shares issued and 27,610 outstanding as of June 30, 2024; and 26,107 shares issued and outstanding as of December 31, 2023	28	26
Additional paid in capital	229,726	221,229
Other comprehensive income (loss)	(7)	0
Accumulated deficit	(212,268)	(203,085)
Total stockholders’ equity	17,479	18,170
Total liabilities and stockholders’ equity	$ 21,868	$ 24,029