Revenue Recognition Revenue Recognition - Contract Balances (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Contract with Customer, Asset and Liability, Rollforward [Roll Forward]
Balance at beginning of period	$ 185	$ 93
Cash received, excluding amounts recognized as revenue	350	185
Amounts recognized as revenue	(117)	(93)
Balance at end of period	$ 418	$ 185