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Summary of Significant Accounting Policies - Product Warranty (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Product Liability Contingency [Line Items]
Product warranty accrual	$ 813,802	$ 933,184
Summary of product warranty activity
Beginning balance	933,000	887,000
Charges to expense	419,000	772,000
Costs incurred	(538,000)	(726,000)
Ending balance	$ 814,000	$ 933,000
Minimum
Product Liability Contingency [Line Items]
Limited product warranty period	1 year
Maximum
Product Liability Contingency [Line Items]
Limited product warranty period	4 years

- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers.

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