CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Current assets
Cash and cash equivalents	$ 24,542	$ 49,493
Short-term investments	66,771	72,834
Other current assets	1,726	3,075
Total current assets	93,039	125,402
Property and equipment, net	558	614
Other long-term assets	2,396	2,001
Total assets	95,993	128,017
Current liabilities
Accounts payable and accrued liabilities	13,790	9,798
Total current liabilities	13,790	9,798
Other liability	24	43
Total liabilities	13,814	9,841
Stockholders’ equity
Preferred stock, $0.001 par value, 10,000,000 shares authorized; none issued and outstanding at both June 30, 2016 and December 31, 2015	0	0
Common stock, $0.001 par value; 100,000,000 shares authorized; 19,924,005 and 19,282,935 issued and outstanding at June 30, 2016 and December 31, 2015, respectively	20	19
Additional paid-in capital	423,149	415,232
Accumulated other comprehensive income	9,618	9,558
Accumulated deficit	(350,608)	(306,633)
Total stockholders’ equity	82,179	118,176
Total liabilities and stockholders’ equity	$ 95,993	$ 128,017