Company-wide Realignments - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Restructuring Cost And Reserve [Line Items]
Reversal of non-cash-stock-based compensation expense	$ 0.4	$ 0.9
Restructuring costs		$ 5.8
One time termination benefits	3.6
Payments for restructuring	3.2
Tetraphase Pharmaceuticals, Inc.
Restructuring Cost And Reserve [Line Items]
Restructuring costs	3.1
Payments for restructuring	2.1
Accrued Payroll and Related Expenses
Restructuring Cost And Reserve [Line Items]
Restructuring charges	0.4
Restructuring costs	3.6
Accrued Payroll and Related Expenses | Tetraphase Pharmaceuticals, Inc.
Restructuring Cost And Reserve [Line Items]
Restructuring charges	$ 1.0