Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 113,308	$ 331,549
Marketable securities	216,169	27,225
Prepaid expenses and other current assets	1,807	2,595
Total current assets	331,284	361,369
Property and equipment, net	512	601
Right-of-use asset	653	602
Total assets	332,449	362,572
Current liabilities:
Accounts payable	12,128	23,831
Accrued expenses	85,567	91,461
Lease liability	653	602
Total current liabilities	98,348	115,894
Long term liabilities:
Loan payable, net of discount	83,965	49,289
Total long term liabilities	83,965	49,289
Total liabilities	182,313	165,183
Stockholders' equity:
Preferred stock, par value $0.0001 per share authorized: 5,000,000 shares at March 31, 2023 and December 31, 2022; 2,369,797 and 2,369,797 shares issued and outstanding at March 31, 2023 and December 31, 2022, respectively
Common stock, par value $0.0001 per share authorized: 200,000,000 at March 31, 2023 and December 31, 2022; 18,283,074 and 18,102,523 shares issued and outstanding at March 31, 2023 and December 31, 2022, respectively	2	2
Additional paid-in-capital	1,189,776	1,160,079
Accumulated other comprehensive loss	(86)	(32)
Accumulated deficit	(1,039,556)	(962,660)
Total stockholders' equity	150,136	197,389
Total liabilities and stockholders' equity	$ 332,449	$ 362,572