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Debt (Tables)

6 Months Ended

Jun. 30, 2020

Debt Disclosure [Abstract]

Components of Debt Balance

The following table presents the carrying value of the Company's debt balance (in thousands):

			June 30, 2020						December 31, 2019
1.75% convertible senior notes due 2025			$	450,000					$	450,000
Debt issuance costs, unamortized			(6,345)						(7,043)
Discount on debt			(97,654)						(107,017)
Debt, long-term			$	346,001					$	335,940

Schedule of Future Principal Repayments of Debt

As of June 30, 2020, future principal repayments of the debt for each of the fiscal years through maturity were as follows (in thousands):

Year Ending December 31:
2020			$	—
2021			—
2022			—
2023			—
2024			—
2025			450,000
			$	450,000

Summary of Interest Expense

Interest expense related to the Convertible Notes for the three and six months ended June 30, 2020 and June 30, 2019, which includes the contractual interest coupon payable semi-annually in cash, the amortization of the issuance costs, accretion of debt discount and finance lease interest expense is as follows (in thousands):

			Three Months Ended June 30,																		Six Months Ended June 30,
			2020						2019						2020						2019
Contractual interest expense			$	1,975					$	1,970					$	3,948					$	3,941
Amortization of debt issuance costs			349						349						698						698
Accretion of debt discount			4,713						4,466						9,363						8,872
Total convertible debt interest expense			7,037						6,785						14,009						13,511
Finance lease interest expense			432						—						871						—
Total interest expense			$	7,469					$	6,785					$	14,880					$	13,511

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- Definition

Tabular disclosure of interest income and expense, including, but not limited to, interest income and expense from investments, loans, and securities.

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Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation.

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Tabular disclosure of the combined aggregate amount of maturities and sinking fund requirements for all long-term borrowings for each of the five years following the date of the latest balance sheet date presented.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601

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