Organization (Details) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2022 USD ($) product	Mar. 31, 2022 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Jun. 30, 2022 USD ($) product segment	Jun. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of therapy products | product	2				2
Number of reportable segments | segment					1
Accumulated deficit	$ 399,340				$ 399,340		$ 383,286
Net loss	8,963	$ 7,091	$ 3,786	$ 3,289	16,054	$ 7,075
Cash and cash equivalents	56,054		$ 51,761		56,054	$ 51,761	$ 68,330
Short term investments	$ 68,400				$ 68,400