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Commitments
12 Months Ended
Dec. 31, 2014
Commitments

16. Commitments

(a) Operating Leases

The Group leases its facilities under non-cancelable operating leases expiring at various dates.

Future minimum lease payments under non-cancelable operating lease agreements as of December 31, 2014 were as follows:

 

Years Ended December 31

   $  

2015

     6,076,979   

2016

     4,975,209   

2017

     3,258,704   

2018

     4,129,875   

2019 and after

     4,762,088   

Total

     23,202,855   

Rental expenses were $5,175,287, $7,054,682 and $7,604,551 for the years ended December 31, 2012, 2013 and 2014, respectively.