Summary of Accrual Activities by Components Related to Company's Restructuring Charges (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019		Dec. 31, 2018
Restructuring Cost And Reserve [Line Items]
Accrued expense beginning balance		$ 1,276		$ 806
Restructuring charges		8,640		2,025
Cash payments		(3,507)		(1,490)
Reclassification of reserves	[1]	(388)
Non-cash write-offs and other adjustments		(3,948)	[2]	(65)
Accrued expense ending balance		2,073		1,276
Severance
Restructuring Cost And Reserve [Line Items]
Accrued expense beginning balance		876		39
Restructuring charges		4,065		1,862
Cash payments		(2,803)		(962)
Non-cash write-offs and other adjustments		(150)	[2]	(63)
Accrued expense ending balance		1,988		876
Facility
Restructuring Cost And Reserve [Line Items]
Accrued expense beginning balance		388		763
Restructuring charges		3,798
Cash payments				(373)
Reclassification of reserves	[1]	(388)
Non-cash write-offs and other adjustments		(3,798)	[2]	(2)
Accrued expense ending balance				388
Other Restructuring Charges
Restructuring Cost And Reserve [Line Items]
Accrued expense beginning balance	[3]	12		4
Restructuring charges	[3]	777		163
Cash payments	[3]	(704)		(155)
Accrued expense ending balance	[3]	$ 85		$ 12

[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 cessation of use of certain leased facilities.

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