Commitments and Contingencies (Details) (USD $)	1 Months Ended
	Mar. 31, 2014 item sqft
Commitments and Contingencies.
Office and laboratory space leased (in square feet)	29,933
Number of additional lease term	1
Scheduled rent payments due	$ 5,600,000
Term of lease	161 days
Initial annual base rent	506,000
Maximum rent until which base rent rises periodically	898,000
Allowance for improvements	1,000,000
Amount of operating lease for which allowance for improvements is provided	449,000
Annual interest rate (as a percent)	8.00%
Additional extension term of lease	5 years
Security deposit in the form of a letter of credit	400,000
Security deposit in the form of a letter of credit which may be reduced in January 2018.	$ 200,000