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Commitments and Contingencies - Additional Information (Detail) (USD $)
 3 Months Ended 6 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Jun. 30, 2014
Performance Guarantee
Jun. 30, 2014
Berkeley, California (the "Berkeley Lease")
Mar. 31, 2014
Berkeley, California (the "Berkeley Lease")
Sep. 30, 2013
Berkeley, California (the "Berkeley Lease")
Jun. 30, 2014
Berkeley, California (the "Berkeley Lease")
Jun. 30, 2014
Dusseldorf, Germany (the "Dusseldorf Lease")
Loss Contingencies [Line Items]                      
Operating leases expiration date                   2018-06 2023-03
Unoccupied facility expense     $ 255,000       $ 200,000 $ 100,000 $ 900,000    
Rent expense, net 400,000 500,000 900,000 900,000              
Deferred rent 600,000   600,000   600,000            
Future payments obligation     $ 40,500,000     $ 1,400,000