Condensed consolidated balance sheets - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents (Note 3)	$ 86,731	$ 52,032
Short-term investments (Note 9)	0	56,053
Receivables, prepayments and deposits	562	740
Total current assets	87,293	108,825
Property and equipment, net	467	905
Long-term prepayments and deposits	54	599
Total assets	87,814	110,329
Current liabilities
Accounts payable and other liabilities	10,749	10,956
Total current liabilities	10,749	10,956
Other liabilities (Note 5)	343	486
Total liabilities	11,092	11,442
Share capital: (Note 6)
Common stock	0	0
Additional paid-in capital	301,922	297,459
Accumulated deficit	(225,200)	(198,502)
Accumulated other comprehensive loss		(70)
Total stockholders' equity	76,722	98,887
Total liabilities and stockholders' equity	$ 87,814	$ 110,329