Significant Events and Transactions of the Period - Summary of Restructuring Reserve (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020
Closing R&D Operations In Palo Alto
Restructuring Reserve [Roll Forward]
Beginning balance		$ 5,581
Restructuring costs	$ 60	560
Restructuring costs - non cash item		0
Amount paid		(5,108)
Ending balance	1,033	1,033
New Organization Structure
Restructuring Reserve [Roll Forward]
Beginning balance		510
Restructuring costs	2,800	3,932
Amount paid		(2,159)
Ending balance	$ 2,283	$ 2,283