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Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2014
Fair Value Disclosures [Abstract]  
Carrying Value and Estimated Fair Value of Financial Instruments

The following table presents the financial instruments that are not carried at fair value but which require fair value disclosure:

 

 

  

December 31,

 

  

December 31,

 

 

  

2013

 

  

2014

 

 

  

Carrying

 

  

Fair

 

  

Carrying

 

  

Fair

 

 

  

amount

 

  

value

 

  

amount

 

  

value

 

Cash and cash equivalents

  

$

38,753

  

  

$

38,753

  

  

$

45,570

  

  

$

45,570

  

Accounts receivable, net

  

 

8,534

  

  

 

8,534

  

  

 

8,747

  

  

 

8,747

  

 

Accounts payable

  

 

1,452

  

  

 

1,452

  

  

 

3,850

  

  

 

3,850