Commitments and contingencies - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified |
0 Months Ended | 9 Months Ended | 9 Months Ended | 36 Months Ended | 3 Months Ended | ||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Jun. 09, 2014
sqft
|
Jun. 03, 2013
sqft
|
Sep. 30, 2014
|
Jun. 30, 2014
Commercial Milestones Payments [Member]
|
Jun. 30, 2014
Pregenen [Member]
|
Jun. 30, 2014
Pregenen [Member]
Preclinical milestones [Member]
|
Jun. 30, 2014
Pregenen [Member]
Clinical Milestone Payments [Member]
|
Jun. 30, 2014
Pregenen [Member]
Commercial Milestones Payments [Member]
|
Sep. 30, 2014
French Credit d'Impot Recherche Program [Member]
|
Dec. 31, 2012
French Credit d'Impot Recherche Program [Member]
|
Sep. 30, 2014
Rent Commencement Date [Member]
|
Sep. 30, 2014
First Anniversary of the Rent Commencement Date [Member]
|
Sep. 30, 2014
Second Anniversary of the Rent Commencement Date [Member]
|
|
Commitments And Contingencies Disclosure [Line Items] | |||||||||||||
Lease period | 9 years | ||||||||||||
Lease building space | 43,600 | ||||||||||||
Monthly lease payments | $ 209 | ||||||||||||
Rent abatement | 209 | ||||||||||||
Contribution from the landlord towards the initial build-out of the space | 1,234 | 6,538 | |||||||||||
Option to extend this lease | 5 years | ||||||||||||
Cash-collateralized irrevocable standby letter of credit | 1,253 | 1,044 | 835 | 627 | |||||||||
Lease expiration date | Mar. 31, 2015 | ||||||||||||
Additional lease building space | 9,869 | ||||||||||||
Additional monthly lease payments | 47 | ||||||||||||
Amendment effective date | 2014-09 | ||||||||||||
Eligible percentage of research expense monetized | 30.00% | ||||||||||||
Aggregate reimbursement | 807 | ||||||||||||
Current assets | 699 | ||||||||||||
Additional future contingent cash payments | $ 99,900 | $ 135,000 | $ 15,000 | $ 20,100 | $ 99,900 |