Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Assets:
Money Market Funds, at Carrying Value	$ 50,054
Total assets measured at fair value	50,241	$ 321
Liabilities:
Total liabilities measured at fair value	151,950	168,350
Derivative
Assets:
Derivative assets	187	321
Liabilities:
Derivative Liability, Current	343	433
Contingent consideration
Liabilities:
Total liabilities measured at fair value	11,349	16,535
Deferred consideration
Liabilities:
Total liabilities measured at fair value	112,994	151,382
Convertible Debt Securities
Liabilities:
Derivative Liability, Current	27,264
Level 1
Assets:
Money Market Funds, at Carrying Value	50,054
Total assets measured at fair value	50,054	0
Liabilities:
Total liabilities measured at fair value	0	0
Level 1 | Derivative
Assets:
Derivative assets	0	0
Level 1 | Contingent consideration
Liabilities:
Total liabilities measured at fair value	0	0
Level 1 | Deferred consideration
Liabilities:
Total liabilities measured at fair value	0	0
Level 2
Assets:
Total assets measured at fair value	187	321
Liabilities:
Total liabilities measured at fair value	140,601	151,815
Level 2 | Derivative
Assets:
Derivative assets	187	321
Liabilities:
Derivative Liability, Current	343	433
Level 2 | Contingent consideration
Liabilities:
Total liabilities measured at fair value	0	0
Level 2 | Deferred consideration
Liabilities:
Total liabilities measured at fair value	112,994	151,382
Level 2 | Convertible Debt Securities
Liabilities:
Derivative Liability, Current	27,264
Level 3
Assets:
Total assets measured at fair value	0	0
Liabilities:
Total liabilities measured at fair value	11,349	16,535
Level 3 | Derivative
Assets:
Derivative assets	0	0
Level 3 | Contingent consideration
Liabilities:
Total liabilities measured at fair value	11,349	16,535
Level 3 | Deferred consideration
Liabilities:
Total liabilities measured at fair value	$ 0	$ 0