Fair Value Measurements - Earn-out Liability - General Information (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Valuation Technique and Input, Description [Abstract]
Earn-out liability, valuation technique	us-gaap:IncomeApproachValuationTechniqueMember	us-gaap:IncomeApproachValuationTechniqueMember
Fair Value, Measurements, Recurring [Member]
Valuation Technique and Input, Description [Abstract]
Earn-out liability	$ 2,000	$ 2,911