Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 129,574	$ 155,385
Prepaid expenses and other current assets	10,269	5,127
Total current assets	139,843	160,512
Property, plant and equipment, net	1,275	1,207
Operating lease right-of-use assets	2,088	2,287
Restricted cash	505	505
Other long-term assets	299	299
Total assets	144,010	164,810
Current liabilities:
Accounts payable (including related party amounts of $78 and $35, respectively)	4,805	9,997
Accrued expenses (including related party amounts of $2,608 and $2,499, respectively)	8,015	14,678
Accrued interest	911	854
Operating lease liabilities, current	712	708
Total current liabilities	14,443	26,237
Long-term debt, net of discount	96,638	95,264
Revenue interest financing liability	114,679	109,525
Operating lease liabilities	945	1,098
Other long-term liabilities	7,500	7,500
Total liabilities	234,205	239,624
Commitments and contingencies (Note 4)
Stockholders’ equity:
Preferred stock, $0.0001 par value; authorized shares - 40,000,000 at March 31, 2023 and December 31, 2022; no shares issued and outstanding at March 31, 2023 and December 31, 2022
Common stock, $0.0001 par value; authorized shares - 400,000,000 at March 31, 2023 and December 31, 2022; issued shares - 43,602,984 and 41,723,308 at March 31, 2023 and December 31, 2022, respectively; outstanding shares - 43,571,140 and 41,468,871 at March 31, 2023 and December 31, 2022, respectively	4	3
Treasury stock - 19 shares at March 31, 2023 and December 31, 2022, respectively	0	0
Additional paid-in capital	674,708	652,276
Accumulated deficit	(764,907)	(727,093)
Total stockholders' (deficit) equity	(90,195)	(74,814)
Total liabilities and stockholders’ equity	$ 144,010	$ 164,810