Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 119,806	$ 20,525
Short-term investments	69,000	205,912
Prepaid expenses and other current assets	2,660	1,253
Total current assets	191,466	227,690
Right-of-use asset	514	948
Other assets	1,881	1,995
Total assets	193,861	230,633
Current liabilities:
Accounts payable	1,138	788
Accrued expenses	7,756	7,690
Current portion of operating lease liabilities	488	582
Total current liabilities	9,382	9,060
Long term portion of operating lease liabilities		357
Total liabilities	9,382	9,417
Commitments (Note 6)
Stockholders' equity:
Common stock, $0.001 par value per share, 150,000,000 shares authorized; 28,042,296 and 27,501,340 shares issued and outstanding at September 30, 2023 and December 31, 2022, respectively	28	28
Additional paid-in capital	638,251	632,512
Accumulated other comprehensive loss		(79)
Accumulated deficit	(549,124)	(507,643)
Total stockholders' equity	184,479	221,216
Total liabilities and stockholders' equity	193,861	230,633
Preferred stock
Stockholders' equity:
Preferred stock
Series X redeemable convertible preferred stock
Stockholders' equity:
Preferred stock	$ 95,324	$ 96,398