Debt - Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Convertible Debt
Debt Instrument [Line Items]
Contractual interest expense	$ 618	$ 1,446
Amortization of debt discount	1,252	114
Amortization of debt issuance costs	72	1,956
Total interest expense	1,942	3,516
Term Loan | Secured Debt
Debt Instrument [Line Items]
Contractual interest expense	1,151	1,180
Amortization of debt discount	333	333
Amortization of debt issuance costs	40	40
Total interest expense	$ 1,524	$ 1,553