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Restructuring Activities (Tables)
 3 Months Ended
Mar. 31, 2018
Restructuring and Related Activities [Abstract]  
Schedule of Restructuring Activities
Our restructuring activities in the three months ended March 31, 2018 were as follows (in thousands):
 
 
December 31, 2017
 
Three Months Ended March 31, 2018
 
March 31, 2018
 
 
Balance
 
Charges
 
Cash Payments
 
Non-Cash Payments
 
Change in Estimates
 
Balance
Severance and benefits
 
$
2,659

 
$
755

 
$
(1,571
)
 
$
—

 
$
—

 
$
1,843

Modification of stock-based compensation awards
 
—

 
105

 
—

 
(105
)
 
—

 
—

Lease termination
 
66

 
21

 
(7
)
 
—

 
—

 
80

Property and equipment impairment due to restructuring
 
—

 
1,077

 
—

 
(1,077
)
 
—

 
—

Professional service fees
 
—

 
215

 
—

 
—

 
—

 
215

Ending balance
 
$
2,725

 
$
2,173

 
$
(1,578
)
 
$
(1,182
)
 
$
—

 
$
2,138