Debt (Tables)

12 Months Ended

Dec. 31, 2019

Debt Disclosure [Abstract]

Schedule of Annual Principal and Interest Payments Due Under Term Loan

As of December 31, 2019, annual principal and interest payments due under the 2019 term loan are as follows: 

Year	Aggregate Minimum Payments (in thousands)
2020		2,736
2021		14,611
2022		14,816
2023		13,903
2024		3,018
Total	$	49,084
Less interest		(7,182	)
Less unamortized portion of final payment		(1,726	)
Total	$	40,176

Summary of Carrying Value of Convertible Notes

The table below summarizes the carrying value of the 2024 Convertible Notes as of December 31, 2019:

	(in thousands)
Gross proceeds	$	201,250
Portion of proceeds allocated to equity component     (additional paid-in capital)		(64,541	)
Debt issuance costs		(6,470	)
Portion of issuance costs allocated to equity     component (additional paid-in capital)		2,075
Amortization of debt discount and debt issuance costs		21,099
Carrying value 2024 Convertible Notes	$	153,413