CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 105,963	$ 107,703
Short-term investments	154,221	43,134
Other current assets	3,412	4,922
Total current assets	263,596	155,759
Property and equipment, net	445	525
Other long-term assets	1,146	962
Total assets	265,187	157,246
Current liabilities
Accounts payable and accrued liabilities	17,811	13,644
Deferred revenue	318	0
Total current liabilities	18,129	13,644
Deferred revenue and other liabilities	714	314
Total liabilities	18,843	13,958
Stockholders’ equity
Preferred stock, $0.001 par value; 10,000,000 shares authorized; none issued and outstanding at both June 30, 2018 and December 31, 2017	0	0
Common stock, $0.001 par value; 100,000,000 shares authorized; 32,313,440 and 28,622,886 issued and outstanding at June 30, 2018 and December 31, 2017, respectively	32	29
Additional paid-in capital	740,172	594,407
Accumulated other comprehensive income	9,345	9,479
Accumulated deficit	(503,205)	(460,627)
Total stockholders’ equity	246,344	143,288
Total liabilities and stockholders’ equity	$ 265,187	$ 157,246