Condensed consolidated balance sheets - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 139,417	$ 143,093
Receivables, prepayments and deposits	236	503
Total current assets	139,653	143,596
Property and equipment, net	2,050	2,060
Operating lease right-of-use assets (Note 4)	10,300	770
Intangible asset, net	513	567
Long-term other assets	535	30
Total assets	153,051	147,023
Current liabilities:
Accounts payable and other liabilities	5,003	4,125
Operating lease liabilities (Note 4)	541	556
Finance lease liabilities (Note 4)	59	62
Total current liabilities	5,603	4,743
Non-current operating lease liabilities (Note 4)	10,182	447
Non-current finance lease liabilities (Note 4)	146	146
Total liabilities	15,931	5,336
Share capital: (Note 5)
Common stock - $0.000001 par value - authorized, 100,000,000 as of March 31, 2020 and December 31, 2019; issued and outstanding, 38,386,160 as of March 31, 2020 and 37,996,849 as of December 31, 2019.
Preferred stock - $0.000001 par value - authorized, 5,000,000 as of March 31, 2020 and December 31, 2019; nil issued and outstanding as of March 31, 2020 and December 31, 2019.
Additional paid-in capital	445,291	441,216
Accumulated deficit	(308,171)	(299,529)
Total shareholders' equity	137,120	141,687
Total liabilities and shareholders' equity	$ 153,051	$ 147,023