Allowance For Credit Losses - Activities In Allowance For Credit Losses (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2020 USD ($)
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of year	$ 0
Initial adoption of ASU 2016-13 (Note 1)	785
Provision for current expected credit losses	2,387
Balance at end of period	3,172
Robotics
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Provision for current expected credit losses	$ 1,700