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Restructuring Activities (Tables)
 3 Months Ended
Mar. 31, 2017
Restructuring and Related Activities [Abstract]  
Reconciliation of restructuring accrual
The following is a reconciliation of the accrual for the workforce reduction that is included within the "Accrued Liabilities" line of the consolidated balance sheets for the three-months ending March 31, 2017 and 2016:
 
 
Three Months Ended
 
 
2017
2016
Restructuring liability at January 1,
 
$
309

$
—

      Amounts expensed
 
61

317

      Amounts paid
 
(184
)
(304
)
Restructuring liability at March 31,
 
$
186

$
13