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Commitments and Contingencies (Tables)
9 Months Ended
Sep. 30, 2019
Commitments and Contingencies Disclosure [Abstract]  
Schedule of roll forward of severance liability
The following table presents a roll forward of the severance liability for the nine months ended September 30, 2019 (in thousands):
 
Severance Liability
Accrual at December 31, 2018
$

Expense
7,871

Cash Payments
(7,809
)
Accrual at September 30, 2019
$
62