Consolidated balance sheets - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Current assets
Cash and cash equivalents (Note 3)	$ 32,301	$ 39,526
Short-term investments (Note 11)	70,758	34,956
Receivables, prepayments and deposits	426	314
Total current assets	103,485	74,796
Property and equipment, net (Note 4)	849	89
Long-term investments (Note 11)	50,046	38,458
Total assets	154,380	113,343
Current liabilities
Accounts payable and other liabilities (Note 5)	9,519	4,792
Total current liabilities	9,519	4,792
Other liabilities (Note 6)	197	131
Total liabilities	9,716	4,923
Commitments and contingencies (Note 13)
Share capital:
Common stock	0	0
Preferred stock
Additional paid-in capital	293,111	219,986
Accumulated deficit	(148,278)	(111,276)
Accumulated other comprehensive loss	(169)	(290)
Total stockholders' equity	144,664	108,420
Total liabilities and stockholders' equity	$ 154,380	$ 113,343