Summary of Accrual Activities by Components Related to Company's Restructuring Charges (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019
Restructuring Cost And Reserve [Line Items]
Accrued expense beginning balance		$ 2,073	$ 1,276
Restructuring charges		4,477	8,640
Cash payments		(4,024)	(3,507)
Reclassification of reserves	[1]		(388)
Non-cash write-offs and other adjustments		(726)	(3,948)	[2]
Accrued expense ending balance		1,800	2,073
Severance
Restructuring Cost And Reserve [Line Items]
Accrued expense beginning balance		1,988	876
Restructuring charges		3,506	4,065
Cash payments		(3,229)	(2,803)
Non-cash write-offs and other adjustments		(584)	(150)	[2]
Accrued expense ending balance		1,681	1,988
Facility
Restructuring Cost And Reserve [Line Items]
Accrued expense beginning balance			388
Restructuring charges		503	3,798
Cash payments		(115)
Reclassification of reserves	[1]		(388)
Non-cash write-offs and other adjustments		(272)	(3,798)	[2]
Accrued expense ending balance		116
Other Restructuring Charges
Restructuring Cost And Reserve [Line Items]
Accrued expense beginning balance	[3]	85	12
Restructuring charges	[3]	468	777
Cash payments	[3]	(680)	(704)
Non-cash write-offs and other adjustments	[3]	130
Accrued expense ending balance	[3]	$ 3	$ 85

[1] Accruals related to facilities exited prior to January 1, 2019 were reclassified to operating lease liabilities upon adoption of ASU 2016-02.

[2] Non-cash write-offs included impairment of operating lease right-of-use assets amounting to $2.6 million associated with the cessations of use of certain leased facilities.

[3] Other restructuring charges mainly related to consulting fees and relocation costs.