Net Loss per Unit and Share - Basic and diluted net loss per share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Net Loss per Unit and Share
Net loss	$ (16,746)	$ (5,200)
Weighted average common shares outstanding, basic and diluted	30,188,575	1,879,986
Net loss per share, basic and diluted	$ (0.55)	$ (2.77)