Consolidated balance sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current assets
Cash and cash equivalents (Note 3)	$ 39,526	$ 14,906
Short-term investments (Note 11)	34,956	24,191
Accounts and other amounts receivable	32	65
Prepayments and deposits	282	139
Total current assets	74,796	39,301
Property and equipment (Note 4)	89	105
Long-term investments (Note 11)	38,458	2,003
Other		13
Total assets	113,343	41,422
Current liabilities
Accounts payable and other liabilities (Note 5)	4,792	5,203
Total current liabilities	4,792	5,203
Other liabilities (Note 6)	131	72
Total liabilities	$ 4,923	$ 5,275
Commitments and contingencies (Note 13)
Share capital:
Common stock	$ 0	$ 0
Preferred stock
Additional paid-in capital	$ 219,986	$ 125,567
Accumulated deficit	(111,276)	(89,416)
Accumulated other comprehensive loss	(290)	(4)
Total stockholders' equity	108,420	36,147
Total liabilities and stockholders' equity	$ 113,343	$ 41,422