Summary of Significant Accounting Policies - Recently Adopted Accounting Pronouncements (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Recent Accounting Pronouncements
Practical expedients - package	true
Practical expedients - hindsight	false
Deferred rent			$ (799)
Operating lease right-of-use asset	$ 6,042	$ 7,500
Lease liability	$ 7,217
ASU 2016-02
Recent Accounting Pronouncements
Operating lease right-of-use asset		7,499
Adjustment | ASU 2016-02
Recent Accounting Pronouncements
Deferred rent		799
Operating lease right-of-use asset		7,499
Lease liability		$ 8,300