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Restructuring Charges (Details) $ in Thousands		3 Months Ended
Restructuring Charges (Details) $ in Thousands	Nov. 08, 2018 employee	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Summary of restructuring balances
Beginning balance		$ 1,419
Payment of employee severance costs		(1,084)
Ending balance		$ 335	$ 1,419
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