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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2013
Commitments and Contingencies  
Schedule of future minimum lease payments under non-cancelable operating leases and purchase commitments

Future minimum lease payments under non-cancelable operating leases and purchase commitments are as follows (in thousands):

Year ended December 31,
  Operating
leases		   Purchase
commitments		   Total  

2014

   $ 756   $ 2,875   $ 3,631  

2015

     713     2,565     3,278  

2016

     735     368     1,103  

2017

     756     —     756  

2018

     734     —     734  

Thereafter

     1,270     —     1,270  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total minimum payments

   $ 4,964   $ 5,808   $ 10,772  
               
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