Summary of Significant Accounting Policies - Fair Value (Details) - Measured on a recurring basis - Acquisitions - USD ($) $ in Thousands	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019
Contingent Consideration
Assets and liabilities measured at fair value on a recurring and nonrecurring basis
Fair value	$ 10,833
Convertible Note
Assets and liabilities measured at fair value on a recurring and nonrecurring basis
Fair value	5,006		$ 5,006
Convertible Senior Notes
Assets and liabilities measured at fair value on a recurring and nonrecurring basis
Fair value	345,975
Significant Other Observable Inputs (Level 2) | Convertible Senior Notes
Assets and liabilities measured at fair value on a recurring and nonrecurring basis
Fair value	345,975
Significant Unobservable Inputs (Level 3) | Contingent Consideration
Assets and liabilities measured at fair value on a recurring and nonrecurring basis
Fair value	10,833
Significant Unobservable Inputs (Level 3) | Convertible Note
Assets and liabilities measured at fair value on a recurring and nonrecurring basis
Fair value	$ 5,006	$ 5,006	$ 5,006	$ 5,006	$ 5,006	$ 5,006