| Balance Sheet Details - Inventory (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014 | 
|---|---|---|
| Balance Sheet Related Disclosures [Abstract] | ||
| Work-in-process | $ 6,859us-gaap_InventoryWorkInProcess | $ 4,169us-gaap_InventoryWorkInProcess | 
| Finished goods | 5,990us-gaap_InventoryFinishedGoods | 6,689us-gaap_InventoryFinishedGoods | 
| Inventory Total | $ 12,849us-gaap_InventoryNet | $ 10,858us-gaap_InventoryNet | 
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- Details 
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- Definition Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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| X | ||||||||||
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- Definition Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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| X | ||||||||||
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- Definition Amount before valuation and LIFO reserves of merchandise or goods in the production process expected to be completed within one year or operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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