| Balance Sheet Details (Details 1) (USD $) In Thousands, unless otherwise specified | 6 Months Ended | |
|---|---|---|
| Jun. 30, 2012 | Dec. 31, 2011 | |
| Property and equipment | ||
| Property and equipment, Gross | $ 12,541 | $ 11,482 | 
| Less accumulated depreciation and amortization | (7,110) | (5,988) | 
| Property and equipment, net | 5,431 | 5,494 | 
| Furniture and Fixtures [Member] | ||
| Property and equipment | ||
| Useful life in years | 5 years | |
| Property and equipment, Gross | 305 | 305 | 
| Machinery and Equipment [Member] | ||
| Property and equipment | ||
| Property and equipment, Gross | 7,133 | 6,875 | 
| Machinery and Equipment [Member] | Maximum [Member] | ||
| Property and equipment | ||
| Useful life in years | 5 years | |
| Machinery and Equipment [Member] | Minimum [Member] | ||
| Property and equipment | ||
| Useful life in years | 3 years | |
| Masks and production equipment [Member] | ||
| Property and equipment | ||
| Useful life in years | 2 years | |
| Property and equipment, Gross | 3,556 | 3,249 | 
| Software [Member] | ||
| Property and equipment | ||
| Useful life in years | 3 years | |
| Property and equipment, Gross | 681 | 558 | 
| Leasehold Improvements [Member] | ||
| Property and equipment | ||
| Property and equipment, Gross | 543 | 489 | 
| Leasehold Improvements [Member] | Maximum [Member] | ||
| Property and equipment | ||
| Useful life in years | 5 years | |
| Leasehold Improvements [Member] | Minimum [Member] | ||
| Property and equipment | ||
| Useful life in years | 4 years | |
| Construction in Progress [Member] | ||
| Property and equipment | ||
| Property and equipment, Gross | $ 323 | $ 6 |