Credit Risk and Allowance for Doubtful Accounts (Details) (USD $)	6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Valuation and Qualifying Accounts Disclosure [Line Items]
Reserves for accounts receivable, net	$ 160,000	$ 150,000
Restocking charge (in hundredths)	20.00%
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Reserves for accounts receivable, net	115,000	120,000
Allowance for Sales Returns [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Reserves for accounts receivable, net	$ 45,000	$ 30,000