Commitments and Contingencies - Litigation (Details) $ in Thousands			9 Months Ended	12 Months Ended
	Aug. 26, 2020 USD ($)	Oct. 14, 2014 participant	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Loss Contingencies [Line Items]
IPO litigation expense				$ 1,165	$ 0	$ 0
New York State Supreme Court, New York County
Loss Contingencies [Line Items]
Number of plaintiffs opting out of settlement (participant) | participant		12
Amount awarded to claimants	$ 1,200
Interest period (in years)	7 years
IPO litigation expense			$ 1,200