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Restructuring Charges (Tables)
 9 Months Ended
Sep. 30, 2019
Restructuring and Related Activities [Abstract]  
Schedule of Restructuring Reserve by Type of Cost
The following table summarizes the activity related to the accrual for restructuring charges (in thousands):
 
2017 Restructuring Plan
 
2015 Restructuring Plan
 
 
 
Workforce Reduction Costs
 
Lease Termination and Other Costs
 
Lease Termination and Other Costs
 
Total
Balance at January 1, 2018
$
44

 
$
—

 
$
221

 
$
265

Restructuring charges
253

 
19

 
317

 
589

Cash payments
(151
)
 
(19
)
 
(218
)
 
(388
)
Write-offs
—

 
—

 
(18
)
 
(18
)
Balance at December 31, 2018
146

 
—

 
302

 
448

Cumulative-effect adjustment to accumulated deficit related to adoption of ASU 2016-02
—

 
—

 
(302
)
 
(302
)
Restructuring charges
97

 
—

 
—

 
97

Cash payments
(200
)
 
—

 
—

 
(200
)
Balance at September 30, 2019
$
43

 
$
—

 
$
—

 
$
43