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Product warranty - Schedule of Product Warranty Reserve (Details) (USD $)
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12 Months Ended | ||
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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| Schedule of Product Warranty Reserve [Roll Forward] | |||
| Warranty reserve, beginning balance | $ 57,000 | $ 53,000 | $ 82,600 |
| Warranty provision for units sold | 160,684 | 76,637 | 42,847 |
| Costs of warranty incurred | (127,484) | (72,637) | (72,447) |
| Warranty reserve, ending balance | $ 90,200 | $ 57,000 | $ 53,000 |
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- Details
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- Definition
Amount as of the balance sheet date of the aggregate standard product warranty liability. Does not include the balance for the extended product warranty liability. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Represents the aggregate decrease in the liability for payments made (in cash or in kind) to satisfy claims under the terms of the standard product warranty. Does not include any Increase or Decrease in the liability for payments related to extended product warranties. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Represents the aggregate increase in the liability for accruals related to standard product warranties issued during the reporting period. Does not include any increase in the liability for accruals related to extended product warranties. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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