CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Current assets
Cash and cash equivalents	$ 14,235	$ 18,403
Short term investments	47,835	18,580
Other current assets	2,145	2,346
Total current assets	64,215	39,329
Other assets	0	139
Property and equipment, net	322	333
Total assets	64,537	39,801
Current liabilities
Accounts payable and accrued liabilities	5,245	5,340
Warrant liability	33,407	0
Total current liabilities	38,652	5,340
Other liability	0	45
Total liabilities	38,652	5,385
Commitments and contingencies
Stockholders' equity
Preferred stock, $0.001 par value, 10,000,000 shares authorized; none issued and outstanding at December 31, 2013 and 2012, respectively	0	0
Common stock, $0.001 par value; 100,000,000 authorized; 13,446,976 and 9,957,725 issued and outstanding at December 31, 2013 and 2012, respectively	13	10
Warrants	0	11,153
Additional paid-in capital	214,756	154,224
Accumulated other comprehensive income	9,507	9,520
Accumulated deficit	(198,391)	(140,491)
Total stockholders' equity	25,885	34,416
Total liabilities and stockholders' equity	$ 64,537	$ 39,801