Fair Value Measurements - Rollforward (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation
Balance - beginning of period	$ 1,200	$ 0	$ 0	$ 0
Additions / issuances	0	0	1,200	0
Change in fair value	3,200	0	3,200	0
Transfer out of Level 3	(2,500)	0	(2,500)	0
Balance - end of period	$ 1,900	$ 0	$ 1,900	$ 0