Cash and Cash Equivalents

12 Months Ended

Dec. 31, 2017

Cash And Cash Equivalents [Abstract]

Cash and Cash Equivalents

3. Cash and cash equivalents

	As of December 31,
	2016		2017
	$		$
Cash at bank and in hand		36,531,272		204,008,828
Cash equivalents		47,417,498		25,651,320
		83,948,770		229,660,148
Denominated in:
US$		77,463,141		224,878,393
RMB (note (i))		6,365,311		3,927,163
Australia dollar ("A$")		120,318		854,592
		83,948,770		229,660,148

Note:

(i) Certain cash and bank balances denominated in RMB were deposited with banks in the PRC. The conversion of these RMB denominated balances into foreign currencies is subject to the rules and regulations of foreign exchange control promulgated by the PRC government.