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Restructuring charges - Restructuring Costs (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]          
Restructuring and Related Costs  
Restructuring charges for each period were as follows:
Year ended December 31,
(in thousands)
202020192018
Cost of revenue
$1,201 $54 $1,379 
Research and development
8,062 585 12,794 
Sales and marketing
10,684 314 5,291 
General and administrative
5,449 501 3,279 
Total restructuring charges
$25,396 $1,454 $22,743 
      
Schedule of Restructuring Reserve by Type of Cost  
The following table provides a summary of the Company’s restructuring activities and the movement in the related liabilities recorded in accrued expenses and other current liabilities, and other long-term liabilities on the Consolidated Balance Sheets under the first quarter 2017 restructuring plan.
(in thousands)
Severance
Other
Total
Restructuring liability as of December 31, 2017— 3,550 3,550 
Restructuring charges (1)
— 4,783 4,783 
Cash paid
— (3,293)(3,293)
Non-cash charges
— 627 627 
Restructuring liability as of December 31, 2018
— 5,667 5,667 
Restructuring charges (1)
— 1,395 1,395 
Cash paid
— (2,257)(2,257)
Non-cash reductions
— (335)(335)
Restructuring liability as of December 31, 2019$— $4,470 $4,470 
Restructuring charges (1)
— (57)(57)
Cash paid
— (3,559)(3,559)
Restructuring liability as of December 31, 2020$— $854 $854 
      
Restructuring charges   $ 25,396 $ 1,454 $ 22,743  
Operating Lease, Impairment Loss   12,460 0 0  
Cost of Revenue [Member]          
Restructuring Cost and Reserve [Line Items]          
Restructuring charges   1,201 54 1,379  
Research and Development [Member]          
Restructuring Cost and Reserve [Line Items]          
Restructuring charges   8,062 585 12,794  
Selling and Marketing Expense [Member]          
Restructuring Cost and Reserve [Line Items]          
Restructuring charges   10,684 314 5,291  
General and Administrative [Member]          
Restructuring Cost and Reserve [Line Items]          
Restructuring charges   5,449 501 3,279  
First quarter 2017 restructuring [Member]          
Restructuring Cost and Reserve [Line Items]          
Restructuring charges $ 23,100        
Restructuring charges   (57) 1,395 4,783  
Restructuring Reserve   854 4,470 5,667 $ 3,550
Other Restructuring Costs   (57) 1,395 4,783  
Cash paid   (3,559) (2,257) (3,293)  
Restructuring Reserve, Settled without Cash     (335) (627)  
First quarter 2017 restructuring [Member] | Non-cancelable Leases, Accelerated Depreciation and Other Charges [Member]          
Restructuring Cost and Reserve [Line Items]          
Restructuring charges 12,800        
First quarter 2017 restructuring [Member] | Employee Severance [Member]          
Restructuring Cost and Reserve [Line Items]          
Restructuring Reserve   0 0 0 0
Severance Costs $ 10,300 0 0 0  
Cash paid   0 0 0  
Restructuring Reserve, Settled without Cash     0 0  
First quarter 2017 restructuring [Member] | Other Restructuring [Member]          
Restructuring Cost and Reserve [Line Items]          
Restructuring Reserve   854 4,470 5,667 $ 3,550
Cash paid   (3,559) (2,257) (3,293)  
Restructuring Reserve, Settled without Cash     (335) $ (627)  
Second quarter 2020 restructuring [Member]          
Restructuring Cost and Reserve [Line Items]          
Restructuring charges   25,500      
Restructuring charges   25,547      
Restructuring Reserve   88 0    
Other Restructuring Costs   5,800      
Cash paid   (8,830)      
Restructuring Reserve, Settled without Cash   (16,629)      
Second quarter 2020 restructuring [Member] | Headquarters campus [Member]          
Restructuring Cost and Reserve [Line Items]          
Operating Lease, Impairment Loss   12,300      
Second quarter 2020 restructuring [Member] | Non-cancelable Leases, Accelerated Depreciation and Other Charges [Member]          
Restructuring Cost and Reserve [Line Items]          
Restructuring charges   5,800      
Second quarter 2020 restructuring [Member] | Employee Severance [Member]          
Restructuring Cost and Reserve [Line Items]          
Restructuring Reserve   49 0    
Severance Costs   7,287      
Cash paid   (7,238)      
Restructuring Reserve, Settled without Cash   0      
Second quarter 2020 restructuring [Member] | Other Restructuring [Member]          
Restructuring Cost and Reserve [Line Items]          
Restructuring Reserve   39 0    
Cash paid   (1,592)      
Restructuring Reserve, Settled without Cash   (4,169)      
Second quarter 2020 restructuring [Member] | ROU Asset Impairment          
Restructuring Cost and Reserve [Line Items]          
Restructuring Reserve   0 $ 0    
Cash paid   0      
Restructuring Reserve, Settled without Cash   $ (12,460)