XML 55 R43.htm IDEA: XBRL DOCUMENT v3.20.2
Deferred Government Grants (Tables)
 3 Months Ended
Mar. 31, 2020
Deferred Government Grants [Abstract]  
Schedule of deferred government grants
   December 31,   March 31, 
   2019   2020 
Total government grants  $4,260,833   $4,155,559 
Less: Current portion   (142,026)   (139,681)
Non-current portion  $4,118,807   $4,015,878