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Long-Term Debt (Tables) | 12 Months Ended
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Dec. 31, 2017
Long-Term Debt [Abstract] |
Convertible Note | The net carrying amount of the Liability Component is as follows (U.S. dollars in thousands):
|  | December 31, 2017 |
Principal |  | $ | 210,000 |
Unamortized debt discount (conversion option) |  |  | (7,078 | )
Total long-term debt, net |  |  | 202,922 |
Unamortized debt discount (issuance costs) |  |  | (4,050 | )
Net carrying amount |  | $ | 198,872 |
Debt Facilities | The following table summarizes the Company's debt facilities as of December 31, 2016 and 2017:
Facility or Arrangement |  | Original Principal Amount |  | Balance as of December 31, 2016 |  | Balance as of December 31, 2017(1)(2) |  | Interest Rate |  | Repayment terms
Credit Agreement term loan facility: |  |  |  |  |  |  |  |  |  |
U.S. dollar denominated: |  | $127.5 million |  | $108.4 million |  | $94.8 million |  | Variable 30 day: 4.319% |  | One half of the principal amount payable in increasing quarterly installments over a five-year period beginning on December 31, 2014, with the remainder payable at the end of the five-year term.
Japanese yen denominated: |  | 6.6 billion yen |  | 5.6 billion yen ($47.9 million as of December 31, 2016) |  | 4.9 billion yen ($43.5 million as of December 31, 2017) |  | Variable 30 day: 2.75% |  | One half of the principal amount payable in increasing quarterly installments over a five-year period beginning on December 31, 2014, with the remainder payable at the end of the five-year term.
Credit Agreement revolving credit facility: |  |  |  |  |  |  |  |  |  |
|  |  |  | $47.5 million |  | $47.5 million |  | Variable 30 day: 4.319% |  | Revolving line of credit expires October 2019.
South Korea subsidiary loan: |  | $20.0 million |  | $10.0 million |  | ─ |  | 1.12% |  | Loan was paid off in March 2017.
Japan subsidiary loan: |  | 2.0 billion yen |  | 1.3 billion yen ($11.4 million as of December 31, 2016) |  | 0.7 billion yen ($5.9 million as of December 31, 2017) |  | 0.66% |  | Payable in semi-annual installments over three years that began on January 31, 2016.
Convertible note |  | $210.0 million |  | $210.0 million |  | $210.0 million |  | 4.75% |  | Principal amount payable on June 15, 2020.
(1) | As of December 31, 2017, the current portion of the Company's debt (i.e. becoming due in the next 12 months) included $16.7 million of the balance of its U.S. dollar denominated debt under the Credit Agreement facility, $7.7 million of the balance of its Japanese yen-denominated debt under the Credit Agreement facility and $5.9 million of the Japan subsidiary loan. The Company has classified the $47.5 million borrowed under the revolving line of credit as short term because it is the Company's intention to use the line of credit to borrow and pay back funds over short periods of time.
(2) | The carrying value of the debt reflects the amounts stated in the above table less a debt discount of $9.1 million and debt issuance costs of $4.0 million (consisting of $11.1 million related to the Convertible Note and $2.0 million related to the credit agreement), which is not reflected in this table.
Maturities of Long-Term Debt | Maturities of all long-term debt at December 31, 2017, based on the year-end exchange rate, are as follows (U.S. dollars in thousands):
Year Ending December 31, |  |  |
2018 |  | $ | 77,840 |
2019 |  |  | 113,928 |
2020 |  |  | 210,000 |
2021 |  | ─ |
2022 |  | ─ |
Thereafter |  | ─ |
Total(1) |  | $ | 401,768 |
(1) | The carrying value of the debt reflects the amounts stated in the above table less a debt discount of $13.1 million, which is not reflected in this table.

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- Definition Tabular disclosure of borrowings which can be exchanged for a specified number of another security at the option of the issuer or the holder. Disclosures include, but are not limited to, principal amount, amortized premium or discount, and amount of liability and equity components. + References No definition available. + Details
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- Definition Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21475-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21538-112644 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21506-112644 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21521-112644 + Details
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- Definition 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://www.xbrl.org/2003/role/presentationRef -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 + Details
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