Valuation and Qualifying Accounts Allowance for Returns and Doubtful Accounts

12 Months Ended

Dec. 31, 2018

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, 2018	$	354,542	(23,080	)	169,350	$	162,112
December 31, 2017	$	260,676	141,234		47,368	$	354,542

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.