Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	[1]
Current assets:
Cash and cash equivalents	$ 91,751	$ 75,383
Short-term investments	120,980	58,593
Accounts receivable	30	10,796
Unbilled license revenue	5,000
Prepaid expenses and other current assets	3,927	4,940
Total current assets	221,688	149,712
Property and equipment, net	6,689	8,032
Other assets	159	159
Total assets	228,536	157,903
Current liabilities:
Accounts payable	3,172	3,933
Accrued compensation and benefits	2,203	3,229
Uncharged license fees	1,000
Accrued and other liabilities	9,234	10,709
Total current liabilities	15,609	17,871
Loan payable, long term	48,836
Other long-term liabilities	677	720
Total liabilities	65,122	18,591
Commitments and contingencies
Stockholders' equity:
Preferred stock, $0.0001 par value; 5,000,000 shares authorized; no shares issued and outstanding as of June 30, 2018 and December 31, 2017, respectively.
Common stock, $0.0001 par value; 300,000,000 shares authorized; 62,053,751 and 47,534,979 shares issued and outstanding as of June 30, 2018 and December 31, 2017, respectively.	6	5
Additional paid-in capital	476,968	417,568
Accumulated deficit	(313,524)	(278,214)
Accumulated other comprehensive loss	(36)	(47)
Total stockholders' equity	163,414	139,312
Total liabilities and stockholders' equity	$ 228,536	$ 157,903

[1] Derived from the audited consolidated financial statements included in the Company’s Annual Report on Form 10K for the year ended December 31, 2017.