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Supplemental financial information - Property Plant and Equipment (Details) (USD $)
In Thousands, unless otherwise specified |
Dec. 31, 2013
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Dec. 31, 2012
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|---|---|---|
| Property, Plant and Equipment [Line Items] | ||
| Property, Plant and Equipment, Gross | $ 6,744 | $ 4,765 |
| Construction-in-progress | 932 | 0 |
| Less accumulated depreciation and amortization | (4,692) | (3,892) |
| Total | 2,052 | 873 |
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Leasehold improvements [Member]
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| Property, Plant and Equipment [Line Items] | ||
| Property, Plant and Equipment, Gross | 451 | 438 |
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Production and lab equipment [Member]
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| Property, Plant and Equipment [Line Items] | ||
| Property, Plant and Equipment, Gross | 4,815 | 3,852 |
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Office and computer equipment [Member]
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| Property, Plant and Equipment [Line Items] | ||
| Property, Plant and Equipment, Gross | $ 546 | $ 475 |