CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Current assets
Cash and cash equivalents	$ 34,555	$ 49,493
Short-term investments	73,114	72,834
Other current assets	2,232	3,075
Total current assets	109,901	125,402
Property and equipment, net	601	614
Other long-term assets	2,001	2,001
Total assets	112,503	128,017
Current liabilities
Accounts payable and accrued liabilities	10,816	9,798
Total current liabilities	10,816	9,798
Other liability	34	43
Total liabilities	10,850	9,841
Stockholders’ equity
Preferred stock, $0.001 par value, 10,000,000 shares authorized; none issued and outstanding at both March 31, 2016 and December 31, 2015	0	0
Common stock, $0.001 par value; 100,000,000 shares authorized; 19,906,776 and 19,282,935 issued and outstanding at March 31, 2016 and December 31, 2015, respectively	20	19
Additional paid-in capital	420,595	415,232
Accumulated other comprehensive income	9,585	9,558
Accumulated deficit	(328,547)	(306,633)
Total stockholders’ equity	101,653	118,176
Total liabilities and stockholders’ equity	$ 112,503	$ 128,017