CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Current assets
Cash and cash equivalents	$ 14,307	$ 6,593
Short-term investments	53,716	22,710
Other current assets	3,166	3,354
Total current assets	71,189	32,657
Property and equipment, net	667	496
Other long-term assets	326	326
Total assets	72,182	33,479
Current liabilities
Accounts payable and accrued liabilities	5,111	5,396
Total current liabilities	5,111	5,396
Other liability	20	21
Total liabilities	5,131	5,417
Stockholders’ equity
Preferred stock, $0.001 par value, 10,000,000 shares authorized; none issued and outstanding at both March 31, 2015 and December 31, 2014	0	0
Common stock, $0.001 par value; 100,000,000 authorized; 16,182,927 and 13,566,726 issued and outstanding at March 31, 2015 and December 31, 2014, respectively	16	14
Additional paid-in capital	311,539	260,616
Accumulated other comprehensive income	9,525	9,521
Accumulated deficit	(254,029)	(242,089)
Total stockholders’ equity	67,051	28,062
Total liabilities and stockholders’ equity	$ 72,182	$ 33,479