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Subsequent Events - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
1 Months Ended
Jul. 31, 2013
CIRM Loan Agreement [Member]
Subsequent Event [Member]
Jun. 30, 2013
Pro Forma [Member]
Subsequent Event [Line Items]    
Proceeds from initial disbursement of the loan $ 3.8  
Pro forma Cash equivalents and marketable securities   $ 28.0