Summary of Significant Accounting Policies - New Accounting Pronouncements (Details) - USD ($) $ in Thousands		1 Months Ended
	Jan. 01, 2019	Feb. 29, 2016	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle
Lease, Practical Expedients, Package [true false]	true
Operating lease right-of-use asset			$ 1,054
Minimum
New Accounting Pronouncements or Change in Accounting Principle
Lease term		12 months
Exton Facility
New Accounting Pronouncements or Change in Accounting Principle
Operating lease right-of-use asset	$ 300
Operating lease liability	$ 300