Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2015

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,
	2015			2014			2013
Balance at beginning of year	$	1,725		$	1,113		$	1,621
Provisions for losses - accounts receivable		1,756			1,897			729
Collection of accounts previously written off		153			—			—
Deductions for accounts charged off or credits issued		(1,994	)		(1,285	)		(1,237	)
Balance at end of year	$	1,640		$	1,725		$	1,113