Nature of the Business and Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2015

Schedule of Estimated Useful Lives of Property and Equipment Including Leasehold Improvements

Property and equipment, including leasehold improvements, are recorded at cost and depreciated when placed into service using the straight-line method, based on their estimated useful lives as follows:


Asset classification		Estimated useful life (in years)
Lab equipment		3 - 7
IT equipment		3 - 7
Leaseholds improvements		Lesser of useful life or lease term
Furniture and fixtures		3 - 7

Schedules of Concentration of Risk by Risk Factor

Gross revenues from each of the Company’s customers who individually accounted for 10% or more of total gross revenues for the years ended December 31, 2015, 2014 and 2013 consisted of the following:


	Years Ended December 31,
	2015	2014	2013
Baxalta	93%	10%	—
Sanofi	—	90%	98%

Gross accounts receivable related to each of the Company’s customers who individually accounted for 10% or more of total gross accounts receivable as of December 31, 2015 and 2014 consisted of the following:


	December 31,
	2015	2014
Baxalta	29%	49%
Sanofi	—	50%
AmerisourceBergen Corporation	29%	—
McKesson Corporation	25%	—
Cardinal Health, Inc.	16%	—