Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Current assets
Cash and cash equivalents	$ 38,863	$ 32,109
Marketable securities	205,531	264,316
Prepaid expenses and other current assets	10,875	10,094
Total current assets	255,269	306,519
Property and equipment, net	1,074	1,648
Operating lease right-of-use assets	2,404	3,131
Other assets	613	618
Total assets	259,360	311,916
Current liabilities
Accounts payable	2,660	5,526
Accrued research and development expenses	8,929	7,779
Current portion of long-term debt	9,589	11,613
Accrued expenses and other current liabilities	14,641	26,680
Total current liabilities	35,819	51,598
Long-term convertible senior notes	196,819	196,591
Long-term debt	0	814
Operating lease liabilities - long-term	0	144
Total liabilities	232,638	249,147
Commitments and contingencies (Note 9)
Stockholders' equity
Common stock, $0.0001 par value; 700,000,000 shares authorized as of March 31, 2024 and December 31, 2023; 226,218,653 shares issued and outstanding as of March 31, 2024, and 225,409,315 shares issued and outstanding as of December 31, 2023	23	23
Additional paid-in capital	1,281,295	1,275,136
Accumulated deficit	(1,253,968)	(1,212,040)
Accumulated other comprehensive loss	(628)	(350)
Total stockholders' equity	26,722	62,769
Total liabilities and stockholders' equity	$ 259,360	$ 311,916