| Fair Value Measurements - Rollforward (Details) - Level 3 $ in Thousands | Sep. 30, 2016  USD ($) | 
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| Warrant liability | |
| Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | |
| Balance at September 28, 2016 | $ 1,223 | 
| Change in fair value | 140 | 
| Balance at September 30, 2016 | 1,363 | 
| Convertible note embedded derivative liability | |
| Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | |
| Balance at September 28, 2016 | 3,693 | 
| Change in fair value | 430 | 
| Balance at September 30, 2016 | $ 4,123 | 
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available. 
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- Definition Amount of gain (loss) recognized on the income statement for financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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