CONDENSED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 20,751	$ 10,575
Restricted cash	270	269
Marketable securities	117,860	152,714
Interest and other receivables	795	1,168
Prepaid and other current assets	2,445	1,332
Total current assets	142,121	166,058
Noncurrent marketable securities	20,404	18,582
Property and equipment, net	348	59
Operating lease, right-of-use asset	349
Other assets	1,032	585
Total assets	164,254	185,284
Current liabilities:
Accounts payable	2,031	982
Accrued compensation and benefits	3,443	2,642
Amount due to Janssen Biotech, Inc.	1,208	2,610
Operating lease liability	349
Accrued liabilities	4,831	1,317
Total current liabilities	11,862	7,551
Commitments and contingencies
Stockholders' equity:
Common stock	193	186
Additional paid-in capital	1,202,902	1,189,194
Accumulated deficit	(1,050,942)	(1,011,464)
Accumulated other comprehensive gain (loss)	239	(183)
Total stockholders' equity	152,392	177,733
Total liabilities and stockholders' equity	$ 164,254	$ 185,284