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Summary of Significant Accounting Policies (Tables)
6 Months Ended
Jun. 30, 2020
Accounting Policies [Abstract]  
Summary of changes in the allowance for doubtful accounts and sales allowances
The following table summarizes the changes in the allowance for doubtful accounts and sales allowances (in thousands):
Three Months Ended June 30, 2020Six Months Ended June 30, 2020
Allowances, at beginning of period$8,054  $6,759  
Charged as a reduction of revenue2,978  5,386  
Charged to bad debt expense in general and administrative expenses1,260  3,485  
Write-offs, net of recoveries(1,833) (5,171) 
Allowances, at end of period$10,459  $10,459