Accrued Expenses - Restructuring Charges (Details) $ in Thousands	1 Months Ended	3 Months Ended
	Sep. 30, 2019 employee	Mar. 31, 2020 USD ($)
Accrued Expenses
Number of employees	86
Minimum
Accrued Expenses
Period for which transition services is provided by noticed employees	4 months
Maximum
Accrued Expenses
Period for which transition services is provided by noticed employees	10 months
Terminated employees
Accrued Expenses
Number of employees	63
Expenses recognized | $		$ 79
Noticed employees
Accrued Expenses
Number of employees	23
Expenses recognized | $		$ 343