Restructuring Charges (Details) $ in Thousands		3 Months Ended	12 Months Ended
	Nov. 08, 2018 employee	Dec. 31, 2018 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Summary of restructuring balances
Beginning balance			$ 1,419	$ 1,077
Current year restructuring costs				1,427	$ 1,774
Payment of employee severance costs			(1,419)	(1,085)
Ending balance		$ 1,419	$ 0	$ 1,419	$ 1,077
Employee Severance
Restructuring Charges
Number of positions eliminated, percent	33.33%
Number of positions eliminated | employee	14
Total costs related to the restructuring		$ 1,400