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Lease Exit Liability (Tables)
3 Months Ended
Mar. 31, 2018
Restructuring and Related Activities [Abstract]  
Changes in Lease Exit Liability
Changes in the lease exit liability are as follows (in thousands):
Accrual balance at December 31, 2017
$
298

Principal payments
(298
)
Accrual balance at March 31, 2018
$