Sublease Agreement (Tables)  | 
9 Months Ended | |||||||||||||||||||||||||
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Sep. 30, 2016  | ||||||||||||||||||||||||||
| Sublease Agreement | ||||||||||||||||||||||||||
| Schedule of changes in liability related to sublease agreement | 
 The changes in the liability related to the sublease agreement for the nine months ended September 30, 2016 were as follows (in thousands): 
 
 
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