Commitments and Contingencies - Narrative (Details) $ in Millions		12 Months Ended
	Jan. 09, 2017 shareholder	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Operating Leased Assets [Line Items]
Option to extend term		5 years
Lease cost		$ 3.4	$ 3.4	$ 3.4
Variable lease		0.9
Operating lease liability, current		$ 1.8
Operating lease, weighted average remaining lease term		7 years 9 months 22 days
Operating lease, average discount rate		22.10%
Number of litigation | shareholder	2
Minimum
Operating Leased Assets [Line Items]
Term of lease		3 years
Maximum
Operating Leased Assets [Line Items]
Term of lease		9 years