Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 21,255	$ 14,839
Securities available-for-sale	14,379	33,310
Other receivables	15	48
Prepaid expenses	3,009	3,598
Total current assets	38,658	51,795
Property and equipment, net	42	78
Other long-term assets	19	19
Total assets	38,719	51,892
Current liabilities:
Accounts payable	3,756	1,470
Accrued expenses	1,816	2,181
Current portion of promissory notes		6,877
Total current liabilities	5,572	10,528
Long-term promissory notes	5,876
Warrant liability		883
Stock-based compensation liability	84	202
Total liabilities	11,532	11,613
Shareholders’ equity:
Common shares, unlimited authorized shares, no par value; 16,844,736 and 16,149,871 shares issued and outstanding at June 30, 2014 and December 31, 2013	113,089	111,204
Contributed surplus	16,052	13,824
Accumulated other comprehensive gain	102	98
Accumulated deficit	(102,056)	(84,847)
Total shareholders’ equity	27,187	40,279
Total liabilities and shareholders’ equity	$ 38,719	$ 51,892