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Summary of significant accounting policies (Tables)
12 Months Ended
Dec. 31, 2014
Summary of significant accounting policies  
Schedule of estimated useful life of related assets

 

                                                                                                                                                                                    

Leasehold improvements

 

Lesser of useful life or lease term

Computer equipment and software

 

3 years

Furniture, fixtures, and lab equipment

 

3 to 7 years