Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 226,361	$ 243,765
Prepaid expenses and other current assets	800	11,836
Total current assets	227,161	255,601
Property, plant and equipment, net	862	463
Operating lease right-of-use assets	2,485	933
Other long-term assets	381	181
Total assets	230,889	257,178
Current liabilities:
Accounts payable (including related party amounts of $331 and $200, respectively)	4,788	699
Accrued expenses (including related party amounts of $415 and $308, respectively)	16,593	2,319
Accrued interest	302	156
Current portion of long-term debt	5,556
Operating lease liabilities, current	431	161
Warrant liabilities		413
Total current liabilities	27,670	3,748
Long-term debt, net of discount	41,062	22,777
Operating lease liabilities	1,644	635
Other long-term liabilities	4,125	2,063
Total liabilities	74,501	29,223
Commitments and contingencies (Note 4)
Stockholders’ equity:
Common stock, $0.0001 par value; authorized shares — 400,000,000; issued shares — 28,964,506; outstanding shares — 25,916,093 at September 30, 2020 and 24,728,258 at December 31, 2019, respectively	3	2
Additional paid-in capital	488,151	484,372
Accumulated deficit	(331,766)	(256,419)
Total stockholders’ equity	156,388	227,955
Total liabilities and stockholders’ equity	$ 230,889	$ 257,178