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Supplemental Balance Sheet Information
 12 Months Ended
Dec. 31, 2019
Receivables [Abstract]  
Supplemental Balance Sheet Information Supplemental Balance Sheet Information
A roll‑forward of the Company’s reserves is as follows:
(a)Allowance for doubtful accounts:
 
 
Year Ended December 31,
 
 
2019
 
2018
 
2017
 
 
(In thousands)
Balance, beginning of period
 
$
4,945

 
$
1,033

 
$
1,076

Additions
 
2,226

 
4,085

 
580

Write-offs
 
(884
)
 
(173
)
 
(623
)
Balance, end of period
 
$
6,287

 
$
4,945

 
$
1,033


Percentage of revenue
 
1
%
 
1
%
 
—
%


(b)Sales credit reserve:
 
 
Year Ended December 31,
 
 
2019
 
2018
 
2017
 
 
(In thousands)
Balance, beginning of period
 
$
3,015

 
$
1,761

 
$
544

Additions
 
18,143

 
5,560

 
2,531

Deductions against reserve
 
(14,374
)
 
(4,306
)
 
(1,314
)
Balance, end of period
 
$
6,784

 
$
3,015

 
$
1,761


Percentage of revenue
 
1
%
 
—
%
 
—
%