Fair Value Measurements - Changes in the earn-out, Level 3 (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Mar. 31, 2019	Jun. 30, 2019
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at the beginning of the period	$ 3,480	$ 11,100	$ 7,075	$ 7,075
Balance at the end of the period		3,480	7,075
Recurring | Level 3
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Payment of Earn-out liability	0	(8,000)	0	0
Revaluations included in earnings	130	$ 380	$ 0	469
Balance at the end of the period	$ 3,610			$ 7,544