Long-term Debt - Schedule of Interest (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Convertible Notes
Debt Instrument [Line Items]
Contractual interest expense	$ 1,509		$ 1,895
Amortization of debt discount and issuance costs	2,604		3,254
Total interest expense	4,113		5,149
Term Loan Agreement
Debt Instrument [Line Items]
Interest expense	$ 4,100	$ 1,900	$ 7,000	$ 3,600