Debt (Tables)

6 Months Ended

Jun. 30, 2019

Debt Disclosure [Abstract]

Schedule of Annual Principal and Interest Payments Due Under Term Loan

As of June 30, 2019, annual principal and interest payments due under the 2015 term loan were as follows: 

Year	Aggregate Minimum Payments (in thousands)
2019		5,146
2020		4,383
Total	$	9,529
Less interest		(181	)
Less unamortized portion of final payment		(392	)
Total	$	8,956

Summary of Carrying Value of Convertible Notes

The table below summarizes the carrying value of the 2024 Convertible Notes as of June 30, 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		16,732
Carrying value 2024 Convertible Notes	$	149,046