CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 32,694	$ 107,703
Short-term investments	190,096	43,134
Other current assets	3,870	4,922
Total current assets	226,660	155,759
Property and equipment, net	473	525
Other long-term assets	1,321	962
Total assets	228,454	157,246
Current liabilities
Accounts payable and accrued liabilities	25,775	13,644
Deferred revenue	371	0
Total current liabilities	26,146	13,644
Deferred revenue and other liabilities	732	314
Total liabilities	26,878	13,958
Stockholders' equity
Preferred stock, $0.001 par value, 10,000,000 shares authorized; none issued and outstanding at both December 31, 2018 and December 31, 2017	0	0
Common stock, $0.001 par value; 100,000,000 authorized; 32,538,857 and 28,622,886 issued and outstanding at December 31, 2018 and December 31, 2017, respectively	33	29
Additional paid-in capital	751,109	594,407
Accumulated other comprehensive income	9,479	9,479
Accumulated deficit	(559,045)	(460,627)
Total stockholders' equity	201,576	143,288
Total liabilities and stockholders' equity	$ 228,454	$ 157,246