Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2014

Accounting Policies [Abstract]

Summary of Adjustments in Allowances for Doubtful Accounts and Sales Adjustments

The following table summarizes the changes in the allowances for doubtful accounts and sales adjustments:

	Years ended December 31,
	2014			2013			2012
Balance at beginning of year	$	1,113		$	1,621		$	990
Provisions for losses - accounts receivable		1,897			729			961
Deductions for accounts charged off or credits issued		(1,285	)		(1,237	)		(330	)
Balance at end of year	$	1,725		$	1,113		$	1,621