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Commitments and Contingencies (Tables)
9 Months Ended
Sep. 30, 2018
Commitments and Contingencies Disclosure [Abstract]  
Schedule of lease exit liability
The following table presents a roll forward of the lease exit liability for the nine months ended September 30, 2018:
 
Lease Exit Costs
Accrual at December 31, 2017
$
1,354

Cash Payments
(419
)
Accrual at September 30, 2018
$
935