CONDENSED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 5,430	$ 15,752
Marketable securities	8,968	54,602
Restricted Cash	40,000	0
Unbilled receivable	218	0
Prepaid expenses and other assets	2,725	3,974
Total current assets	57,341	74,328
Property and equipment, net	4,044	3,894
Operating lease right-of-use asset	1,582	1,608
Other non-current assets	469	295
Total assets	63,436	80,125
Current liabilities:
Accounts payable	714	845
Accrued expenses and other current liabilities	2,414	3,266
Operating lease liability	283	245
Financing lease liability	7	6
Debt, net	42,293	41,693
Total current liabilities	45,711	46,055
Operating lease liability	1,379	1,449
Financing lease liability	13	16
Total liabilities	47,103	47,520
Commitments and Contingencies (Note 10)
Stockholders’ equity:
Preferred stock, $0.0001 par value; 10,000,000 shares authorized; no shares issued and outstanding as of June 30, 2022 and December 31, 2021	0	0
Common stock, $0.0001 par value; 200,000,000 authorized; 27,624,197 shares issued and 27,519,053 shares outstanding as of June 30, 2022 and December 31, 2021	3	3
Treasury stock, at cost, 105,144 shares as of June 30, 2022 and December 31, 2021	0	0
Additional paid-in capital	173,998	171,597
Accumulated deficit	(157,604)	(138,966)
Accumulated other comprehensive loss	(64)	(29)
Total stockholders’ equity	16,333	32,605
Total liabilities and stockholders’ equity	$ 63,436	$ 80,125