Condensed consolidated balance sheets - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Current assets
Cash and cash equivalents (Note 3)	$ 35,691	$ 39,526
Short-term investments (Note 8)	33,024	34,956
Receivables, prepayments and deposits	772	314
Total current assets	69,487	74,796
Property and equipment, net	104	89
Long-term investments (Note 8)	38,623	38,458
Total assets	108,214	113,343
Current liabilities
Accounts payable and other liabilities	5,723	4,792
Total current liabilities	5,723	4,792
Other liabilities (Note 4)	106	131
Total liabilities	5,829	4,923
Share capital: (Note 5)
Common stock	0	0
Additional paid-in capital	220,419	219,986
Accumulated deficit	(117,987)	(111,276)
Accumulated other comprehensive loss	(47)	(290)
Total stockholders' equity	102,385	108,420
Total liabilities and stockholders' equity	$ 108,214	$ 113,343