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Commitments and contingencies (Details) (USD $)
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3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
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Sep. 30, 2013
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Sep. 30, 2012
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Sep. 30, 2013
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Sep. 30, 2012
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Accounts Receivable [Member]
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| Concentration Risk [Line Items] | ||||
| Number of customers | 3 | 3 | ||
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Net sales [Member]
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| Concentration Risk [Line Items] | ||||
| Number of customers | 3 | 1 | 3 | 3 |
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Net sales [Member] | Customer One [Member]
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| Concentration Risk [Line Items] | ||||
| Risk percentage | 43.00% | 96.00% | 43.00% | 41.00% |
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Net sales [Member] | Customer Two [Member]
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| Concentration Risk [Line Items] | ||||
| Risk percentage | 22.00% | 22.00% | 31.00% | |
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Net sales [Member] | Customer Three [Member]
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| Concentration Risk [Line Items] | ||||
| Risk percentage | 35.00% | 35.00% | 13.00% | |
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Employment Contracts [Member]
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| Employee Contracts [Line Items] | ||||
| Number of officers | 3 | |||
| Officers compensation | $ 780,000 | |||