CONDENSED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 22,865	$ 13,644
Restricted cash	363	270
Marketable securities	195,881	125,681
Interest and other receivables	822	802
Prepaid and other current assets	812	1,211
Total current assets	220,743	141,608
Noncurrent marketable securities	46,223	19,651
Property and equipment, net	734	408
Operating leases, right-of-use assets	5,492	2,497
Deposits and other assets	1,622	1,353
Total assets	274,814	165,517
Current liabilities:
Accounts payable	3,797	1,181
Accrued compensation and benefits	4,204	4,830
Amount due to Janssen Biotech, Inc.		14,269
Operating lease liabilities	856	354
Accrued liabilities	10,285	7,528
Total current liabilities	19,142	28,162
Noncurrent operating lease liabilities	4,991	2,200
Commitments and contingencies
Stockholders' equity:
Common stock	310	200
Additional paid-in capital	1,362,373	1,214,835
Accumulated deficit	(1,112,191)	(1,080,012)
Accumulated other comprehensive gain	189	132
Total stockholders' equity	250,681	135,155
Total liabilities and stockholders' equity	$ 274,814	$ 165,517