Valuation and Qualifying accounts (Tables)

12 Months Ended

Dec. 31, 2016

Valuation and Qualifying Accounts [Abstract]

Schedule Of Valuation And Qualifying Accounts [Table Text Block]

	Balance at Beginning of Period		Charged/ (Credited) to Revenues and Expenses			Write-Off of Previously Provided Accounts		Balance at End of Period
Year Ended December 31, 2016:
Allowance for Doubtful Accounts	$	31	$	5		$	—	$	36
Allowance for Customer Returns and Sales Credits	$	490	$	3,713		$	3,675	$	528
Year Ended December 31, 2015:
Allowance for Doubtful Accounts	$	57	$	(19	)	$	7	$	31
Allowance for Customer Returns and Sales Credits	$	401	$	3,442		$	3,353	$	490
Year Ended December 31, 2014:
Allowance for Doubtful Accounts	$	353	$	(46	)	$	250	$	57
Allowance for Customer Returns and Sales Credits	$	530	$	3,729		$	3,858	$	401