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Other Long-Term Debt (Tables)
 12 Months Ended
Dec. 31, 2016
Debt Disclosure [Abstract]  
Summary of Other Long-Term Debt

Other long-term debt consists of the following at December 31, 2016 and 2015 (in thousands):

 

 

2016

 

 

2015

 

Promissory note payable, due in monthly principal installments

   of $26, plus interest at 6.31%, commencing January 2007,

   with balance due on January 2017

 

4,616

 

 

 

4,922

 

Less current portion

 

(4,616

)

 

 

(306

)

 

$

—

 

 

$

4,616