Condensed consolidated balance sheets - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current assets
Cash and cash equivalents (Note 3)	$ 20,916	$ 32,301
Short-term investments (Note 8)	100,665	70,758
Receivables, prepayments and deposits	855	426
Total current assets	122,436	103,485
Property and equipment, net	885	849
Long-term investments (Note 8)	20,008	50,046
Total assets	143,329	154,380
Current liabilities
Accounts payable and other liabilities	5,824	9,519
Total current liabilities	5,824	9,519
Other liabilities (Note 4)	562	197
Total liabilities	6,386	9,716
Share capital: (Note 5)
Common stock	0	0
Additional paid-in capital	293,783	293,111
Accumulated deficit	(156,635)	(148,278)
Accumulated other comprehensive loss	(205)	(169)
Total stockholders' equity	136,943	144,664
Total liabilities and stockholders' equity	$ 143,329	$ 154,380