Cash and Cash Equivalents

12 Months Ended

Dec. 31, 2018

Cash And Cash Equivalents [Abstract]

Cash and Cash Equivalents

3. Cash and cash equivalents

	As of December 31,
	2017		2018
	$		$
Cash at bank and in hand		204,008,828		36,778,028
Cash equivalents		25,651,320		26,173,579
		229,660,148		62,951,607
Denominated in:
US$		224,878,393		58,253,341
RMB (note (i))		3,927,163		3,916,262
Hong Kong dollar (”HK$"）		—		19,890
Australia dollar ("A$")		854,592		762,114
		229,660,148		62,951,607

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.