Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2017

Summary of Changes in Reserve for Allowance for Doubtful Accounts, Sales Returns and Allowances

The following table represents a summary of the changes in the reserve for allowance for doubtful accounts, and sales returns and allowances for fiscal 2017, 2016 and 2015 (in thousands):

	2017			2016		2015
Balance at beginning of fiscal year	$	15,253		$	9,975	$	6,392
(Credit) charges to expenses		(566	)		1,386		2,997
(Write-offs) recoveries, net		(4,457	)		3,892		586
Balance at end of fiscal year	$	10,230		$	15,253	$	9,975