Fair Value of Financial Instruments - Fair Value Relating to Financial Assets and Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Convertible senior notes, unamortized discount	$ 3,531	$ 3,926
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Convertible notes	108,969	108,574
Amount outstanding under letters of credit	1,149	1,142
Carrying Value \| ABL Facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Credit facilities	29,130	15,235
Carrying Value \| Japan ABL Facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Credit facilities	13,469	0
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Convertible notes	135,377	126,222
Amount outstanding under letters of credit	1,149	1,142
Fair Value \| ABL Facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Credit facilities	29,130	15,235
Fair Value \| Japan ABL Facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Credit facilities	$ 13,469	$ 0

Fair value portion of borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Convertible Security

-URI http://asc.fasb.org/extlink&oid=6509036

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- Definition

The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

+ References

Reference 1: 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=6451184&loc=d3e28541-108399

Reference 2: 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=34725769&loc=d3e28878-108400

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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- Definition

Fair value portion of contractual arrangement with a lender under which borrowings can be made up to a specific amount at any point in time.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Line-of-Credit Arrangement

-URI http://asc.fasb.org/extlink&oid=6517033

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