Fair Value Measurements - Schedule of Activity of Major Classes of Assets Measured at Fair Value Using Level 3 Inputs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ (6,300)	$ (8,631)
Fair value adjustment to contingent consideration included in general and administrative expense	0	(1,835)
Cash paid upon achievement of milestone	6,300	4,166
Ending balance	$ 0	$ (6,300)