Commitments and Contingencies (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Loss Contingencies [Line Items]
Operating leases, rent expense	$ 1,365,000	$ 909,000	$ 651,000
Compensation to employees, in the event the company consummates	8,400,000
Severance compensation fee	0	$ 0
Lease Agreements | Floor 20th At Lexington Avenue4 20 New York
Loss Contingencies [Line Items]
Lease rent per month	80,000
Lease Agreements | Property At Bucks County Biotechnology Center In Doylestown Pennsylvania
Loss Contingencies [Line Items]
Lease rent per month	3,700
Lease Agreements | Wayne Pennsylvania
Loss Contingencies [Line Items]
Lease rent per month	$ 10,000