CONDENSED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 44,956	$ 13,644
Restricted cash	363	270
Marketable securities	182,667	125,681
Interest and other receivables	989	802
Prepaid and other current assets	2,886	1,211
Total current assets	231,861	141,608
Noncurrent marketable securities	45,768	19,651
Property and equipment, net	689	408
Operating leases, right-of-use assets	5,425	2,497
Deposits and other assets	2,050	1,353
Total assets	285,793	165,517
Current liabilities:
Accounts payable	3,739	1,181
Accrued compensation and benefits	5,554	4,830
Amount due to Janssen Biotech, Inc.		14,269
Operating lease liabilities	872	354
Accrued liabilities	13,989	7,528
Total current liabilities	24,154	28,162
Noncurrent operating lease liabilities	4,922	2,200
Term loan, net	23,885
Total liabilities	52,961	30,362
Commitments and contingencies
Stockholders' equity:
Common stock	310	200
Additional paid-in capital	1,364,194	1,214,835
Accumulated deficit	(1,131,842)	(1,080,012)
Accumulated other comprehensive gain	170	132
Total stockholders' equity	232,832	135,155
Total liabilities and stockholders' equity	$ 285,793	$ 165,517