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Balance Sheet Components - Additional Information (Detail) (USD $)
3 Months Ended 12 Months Ended 176 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Mar. 31, 2014
Collaboration Arrangement Disclosure [Abstract]        
Depreciation expense $ 488,000 $ 453,000   $ 9,399,000
Outstanding obligations related to construction-in-progress 3,000,000   1,800,000  
Capitalized interest costs $ (231,000)      $ (684,000)