Revision of Prior Period Financial Statements - Schedule of Revised Consolidated Statements of Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net loss	$ (9,065)	$ (8,250)
Net change in unrealized gain on investments	282	43
Comprehensive loss	$ (8,783)	(8,207)
As Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net loss		(8,019)
Comprehensive loss		(7,976)
Adjustment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net loss		(231)
Comprehensive loss		$ (231)