Long-term Debt - Schedule of Interest (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Convertible Notes
Debt Instrument [Line Items]
Contractual interest expense	$ 1,493		$ 3,388
Amortization of debt discount and issuance costs	2,655		5,910
Total interest expense	4,148		9,298
Term Loan Agreement
Debt Instrument [Line Items]
Interest expense	$ 4,200	$ 2,400	$ 11,200	$ 6,100