Revenue Recognition - Contract Balances (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Contract with Customer, Asset and Liability, Rollforward [Roll Forward]
Balance at beginning of period	$ 185	$ 93
Cash received, excluding amounts recognized as revenue	694	185
Amounts recognized as revenue	(477)	(93)
Balance at end of period	$ 402	$ 185