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Long-Term Debt, Debt Facilities (Details) $ in Thousands, ¥ in Billions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2017 JPY (¥) | Dec. 31, 2016 JPY (¥) | Jun. 16, 2016 USD ($) | Oct. 09, 2014 USD ($) | Oct. 09, 2014 JPY (¥)
Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |
Balance | [1] | $ 401,768 |  |  |  |  |  |  |  |  |
Current portion of long-term debt |  | 77,840 |  | $ 82,727 |  |  |  |  |  |  |
Unamortized debt discount |  | 9,100 |  |  |  |  |  |  |  |  |
Unamortized debt issuance costs |  | 4,000 |  |  |  |  |  |  |  |  |
Unamortized debt discount and debt issuance costs |  | 13,100 |  |  |  |  |  |  |  |  |
Interest expense |  | 22,200 |  | 15,600 | $ 7,900 |  |  |  |  |  |
Credit Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |
Unamortized debt discount and debt issuance costs |  | 2,000 |  |  |  |  |  |  |  |  |
Term Loan Facility [Member] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |
Original principal amount |  | 127,500 |  |  |  |  |  |  |  | $ 127,500 |
Balance |  | $ 94,800 | [2],[3] | 108,400 |  |  |  |  |  |  |
Interest rate |  | Variable 30 day: 4.319% |  |  |  |  |  |  |  |  |
Interest rate |  | 4.319% |  |  |  | 4.319% |  |  |  |  |
Term of variable rate |  | 30 days |  |  |  |  |  |  |  |  |
Repayment terms |  | 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. |  |  |  |  |  |  |  |  |
Percentage of principal payable in installments |  | 50.00% |  |  |  |  |  |  |  |  |
Frequency of payment |  | Quarterly |  |  |  |  |  |  |  |  |
Term of loan |  | 5 years |  |  |  |  |  |  |  |  |
Current portion of long-term debt |  | $ 16,700 |  |  |  |  |  |  |  |  |
Japanese Yen Term Loan Facility [Member] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |
Original principal amount | ¥ |  |  |  |  |  | ¥ 6.6 |  |  |  |  | ¥ 6.6
Balance |  | $ 43,500 | [2],[3] | 47,900 |  | ¥ 4.9 | [2],[3] | ¥ 5.6 |  |  |
Interest rate |  | Variable 30 day: 2.75% |  |  |  |  |  |  |  |  |
Interest rate |  | 2.75% |  |  |  | 2.75% |  |  |  |  |
Term of variable rate |  | 30 days |  |  |  |  |  |  |  |  |
Repayment terms |  | 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. |  |  |  |  |  |  |  |  |
Percentage of principal payable in installments |  | 50.00% |  |  |  |  |  |  |  |  |
Frequency of payment |  | Quarterly |  |  |  |  |  |  |  |  |
Term of loan |  | 5 years |  |  |  |  |  |  |  |  |
Current portion of long-term debt |  | $ 7,700 |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |
Balance |  | $ 47,500 | [2],[3] | 47,500 |  |  |  |  |  |  |
Interest rate |  | Variable 30 day: 4.319% |  |  |  |  |  |  |  |  |
Interest rate |  | 4.319% |  |  |  | 4.319% |  |  |  |  |
Term of variable rate |  | 30 days |  |  |  |  |  |  |  |  |
Repayment terms |  | Revolving line of credit expires October 2019. |  |  |  |  |  |  |  |  |
Term of loan |  | 5 years |  |  |  |  |  |  |  |  |
South Korea Subsidiary Loan [Member] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |
Original principal amount |  | $ 20,000 |  |  |  |  |  |  |  |  |
Balance |  | $ 0 | [2],[3] | 10,000 |  |  |  |  |  |  |
Interest rate |  | 1.12% |  |  |  | 1.12% |  |  |  |  |
Repayment terms |  | Loan was paid off in March 2017. |  |  |  |  |  |  |  |  |
Japan Subsidiary Loan [Member] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |
Original principal amount | ¥ |  |  |  |  |  | ¥ 2.0 |  |  |  |  |
Balance |  | $ 5,900 | [2],[3] | 11,400 |  | ¥ 0.7 | [2],[3] | ¥ 1.3 |  |  |
Interest rate |  | 0.66% |  |  |  | 0.66% |  |  |  |  |
Repayment terms |  | Payable in semi-annual installments over three years that began on January 31, 2016. |  |  |  |  |  |  |  |  |
Frequency of payment |  | Semi-annual |  |  |  |  |  |  |  |  |
Term of loan |  | 3 years |  |  |  |  |  |  |  |  |
Current portion of long-term debt |  | $ 5,900 |  |  |  |  |  |  |  |  |
Convertible Note [Member] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |
Original principal amount |  | 210,000 |  |  |  |  |  |  | $ 210,000 |  |
Balance |  | $ 210,000 |  | $ 210,000 |  |  |  |  |  |  |
Interest rate |  | 7.10% |  |  |  | 7.10% |  |  |  |  |
Interest rate |  | 4.75% |  |  |  | 4.75% |  |  |  |  |
Repayment terms |  | Principal amount payable on June 15, 2020. |  |  |  |  |  |  |  |  |
Unamortized debt discount |  | $ 7,078 |  |  |  |  |  |  |  |  |
Unamortized debt issuance costs |  | 4,050 |  |  |  |  |  |  |  |  |
Unamortized debt discount and debt issuance costs |  | 11,100 |  |  |  |  |  |  |  |  |
Interest expense |  | $ 14,000 |  |  |  |  |  |  |  |  |
[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.
[2] | 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.
[3] | 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.

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