Restructuring Restructuring (Tables)
 12 Months Ended
Dec. 31, 2016
Restructuring and Related Activities [Abstract]  
Restructuring liability
The change in the restructuring liability is summarized as follows (in thousands):
 
December 31,
 
2016
 
2015
 
Accrued restructuring balance, beginning of period
$
—

 
$
—

 
Employee severance
1,789

 
199

 
Lease related
314

 
331

 
Cash payments
(1,533
)
 
(530
)
 
Accrued restructuring balance, end of period
$
570

 
$
—