Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Assets
Cash and cash equivalents	$ 375,185	$ 129,780
Prepaid expenses and other current assets	4,633	3,329
Total current assets	379,818	133,109
Property and equipment, net	795	718
Other assets	1,496	1,510
Total assets	382,109	135,337
Liabilities and stockholders’ deficit
Accounts payable	5,000	2,067
Accrued direct research liabilities	18,449	12,627
Other current liabilities	8,083	3,511
Current portion of term loan		1,229
Current portion of deferred revenue	31,335	28,183
Total current liabilities	62,867	47,617
Other long-term liabilities	531	53
Term loan, net of current portion and debt issuance costs	78,881	18,385
Deferred revenue, net of current portion	202,285	216,255
Total noncurrent liabilities	281,697	234,693
Commitments and contingencies
Stockholders’ equity (deficit):
Additional paid-in capital	432,273	190,145
Shareholder notes receivable		(2)
Accumulated deficit	(394,758)	(337,143)
Total stockholders’ equity (deficit)	37,545	(146,973)
Total liabilities and stockholders’ equity (deficit)	382,109	135,337
Common Stock A
Stockholders’ equity (deficit):
Common stock value	24	20
Common Stock B
Stockholders’ equity (deficit):
Common stock value	$ 6	$ 7