Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands			12 Months Ended
	Jan. 01, 2020	Sep. 01, 2018	Dec. 31, 2019	Dec. 31, 2018
Summary Of Significant Accounting Policies [Line Items]
Outstanding claim			$ 0
Impairment of long-lived assets			$ 0
Tax positions, description			The Company determines whether it is more likely than not that a tax position will be sustained upon examination. If it is not more likely than not that a position will be sustained, none of the benefit attributable to the position is recognized. The tax benefit to be recognized for any tax position that meets the more-likely-than-not recognition threshold is calculated as the largest amount that is more than 50% likely of being realized upon resolution of the contingency.
Reduction to deferred rent			$ (410)	$ (10,033)
ASU 2016-02 | Subsequent Event | Minimum
Summary Of Significant Accounting Policies [Line Items]
Lease liability	$ 17,000
Right-of-use asset	6,000
Reduction to deferred rent	(10,000)
ASU 2016-02 | Subsequent Event | Maximum
Summary Of Significant Accounting Policies [Line Items]
Lease liability	18,000
Right-of-use asset	7,000
Reduction to deferred rent	$ (11,000)
Employee Stock Purchase Plan
Summary Of Significant Accounting Policies [Line Items]
Purchase of common stock through payroll deductions expressed in percentage of fair market value		85.00%	85.00%
Share based compensation, discount from market price			15.00%
Share based compensation arrangement by share based payment purchase period			180 days