Valuation and Qualifying Accounts Allowance for Returns and Doubtful Accounts

12 Months Ended

Dec. 31, 2017

Valuation and Qualifying Accounts [Abstract]

Valuation and Qualifying Accounts - Allowance for Returns and Doubtful Accounts

Valuation and Qualifying Accounts – Allowance for Returns and Doubtful Accounts

Period Ended	Balance at Beginning of Period		Charges / (Benefits) to Revenue	(Increases) Deductions	Balance at End of Period
December 31, 2017	$	260,676	141,234	47,368	$	354,542
December 31, 2016	$	191,285	104,228	34,837	$	260,676

Note: Charges/benefits to the allowance for doubtful accounts are recorded within “general and administrative expenses” within the consolidated statements of operations. Charges/benefits to the return reserve for product and service are recorded within “product revenue” within the consolidated statements of operations.