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Long-term debt - Summary of Current and Noncurrent Debt (Details) (USD $)
In Thousands, unless otherwise specified |
Dec. 31, 2013
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Dec. 31, 2012
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|---|---|---|
| Debt Instrument [Line Items] | ||
| Long-term Debt | $ 11,897 | $ 1,070 |
| Less current portion | (18) | (336) |
| Total | 11,879 | 734 |
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Term Loan Credit Agreeement, Net of Debt Discount [Member]
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| Debt Instrument [Line Items] | ||
| Long-term Debt | 11,879 | 0 |
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Wisconsin Economic Development Corporation - CDI [Member]
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| Debt Instrument [Line Items] | ||
| Long-term Debt | 0 | 377 |
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Wisconsin Economic Development Corporation- SCP [Member]
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||
| Debt Instrument [Line Items] | ||
| Long-term Debt | 0 | 657 |
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Licensing Agreements [Member]
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| Debt Instrument [Line Items] | ||
| Long-term Debt | 18 | 34 |
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Other Long-term Debt Obligations [Member]
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| Debt Instrument [Line Items] | ||
| Long-term Debt | $ 0 | $ 2 |