Commitments and Contingencies (Details) (USD $)	1 Months Ended				1 Months Ended
	Mar. 31, 2014 item	Jan. 30, 2014 Office space in Bedford, Massachusetts item	Jan. 30, 2014 Office space in Bedford, Massachusetts Minimum	Jan. 30, 2014 Office space in Bedford, Massachusetts Maximum	Jan. 30, 2014 Office space in Bedford, Massachusetts Lease term commencing on November 1, 2014 sqft	Jan. 30, 2014 Office space in Bedford, Massachusetts Lease term commencing on February 1, 2015 sqft
Legal Matters
Amount of damages sought	$ 2,600,000
Matters that might have a material adverse effect on financial position, results of operations or cash flows	0
Operating leases
Area of office space (in square feet)					105,874	36,799
Initial term of lease					10 years 5 months
Number of successive five-year terms for which the lease may be extended		2
Extension period of lease term		5 years
Base annual rent expense			2,200,000	3,900,000
Gross Payments
2015	947,000
2016	3,258,000
2017	3,329,000
2018	3,400,000
2019	3,472,000
Thereafter	21,401,000
Total	$ 35,807,000