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Balance Sheet Components (Acquired Intangible Assets) (Details) (USD $)
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3 Months Ended | 9 Months Ended | 12 Months Ended | |||
|---|---|---|---|---|---|---|
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Sep. 30, 2014
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Sep. 30, 2013
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Sep. 30, 2014
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Sep. 30, 2013
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Dec. 31, 2013
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Jul. 15, 2013
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| Acquired Finite-Lived Intangible Assets [Line Items] | ||||||
| Carrying value | $ 410,000 | $ 410,000 | $ 410,000 | |||
| Accumulated amortization | (198,000) | (198,000) | (75,000) | |||
| Intangible assets, net | 212,000 | 212,000 | 335,000 | |||
| Weighted average remaining life (in years) | 1 year 3 months 18 days | 2 years | ||||
| Intangible assets held for sale | 2,200,000 | |||||
| Amortization of intangibles | 41,000 | 172,000 | 123,000 | 172,000 | ||
| Estimated future amortization expense in 2014 | 41,000 | 41,000 | ||||
| Estimated future amortization expense in 2015 | 171,000 | 171,000 | ||||
| Percentage of intangible assets impaired | 50.00% | 50.00% | 100.00% | |||
| Impairment of intangibles | 0 | 1,576,000 | 0 | 1,576,000 | ||
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Tranzyme Inc. [Member]
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| Acquired Finite-Lived Intangible Assets [Line Items] | ||||||
| Intangible assets, net | $ 5,900,000 | |||||