Restructuring - Additional Information (Details) - USD ($)		12 Months Ended
	Feb. 13, 2018	Dec. 31, 2018
Restructuring Cost And Reserve [Line Items]
Restructuring implementation date	Feb. 13, 2018
Percentage of employee affected under reduction in force	9.00%
Restructuring charge	$ 3,700,000	$ 3,749,000
Non-cash benefit, net		454,000
Cease-Use Costs
Restructuring Cost And Reserve [Line Items]
Restructuring charge		2,538,000
Non-cash benefit, net		$ 454,000
The lease period of restructuring liability		2023-01