Long-Term Debt - Change in Fair Value of Initial Warrant (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Change in fair value of warrant	$ 5,205	$ 0
Initial Warrant
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	6,537
Change in fair value of warrant	(5,205)
Ending balance	$ 1,332