Debt (Tables)

3 Months Ended

Mar. 31, 2019

Debt Disclosure [Abstract]

Schedule of Annual Principal and Interest Payments Due Under Term Loan

As of March 31, 2019, annual principal and interest payments due under the 2015 term loan were as follows: 

Year	Aggregate Minimum Payments (in thousands)
2019		7,779
2020		4,383
Total	$	12,162
Less interest		(323	)
Less unamortized portion of final payment		(559	)
Total	$	11,280

Summary of Carrying Value of Convertible Notes

The table below summarizes the carrying value of the 2024 Convertible Notes as of March 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		14,625
Carrying value 2024 Convertible Notes	$	146,939