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Restructuring Activities (Tables)
 9 Months Ended
Sep. 30, 2016
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- and nine-months ending September 30, 2016 and 2015:
 
 
Three Months Ended
 
 
2016
2015
Restructuring liability at June 30,
 
$
—

$
—

      Amounts expensed
 
1,108

—

      Amounts paid
 
(616
)
—

Restructuring liability at September 30,
 
$
492

$
—


 
 
Nine Months Ended
 
 
2016
2015
Restructuring liability at January 1,
 
$
—

$
—

      Amounts expensed
 
1,425

235

      Amounts paid
 
(933
)
(235
)
Restructuring liability at September 30,
 
$
492

$
—