Restructuring Charges - Summary of Components of Restructuring Activity (Detail) $ in Thousands	12 Months Ended
Dec. 31, 2017 USD ($)
Restructuring Cost And Reserve [Line Items]
Expense incurred during the year ended December 31, 2017	$ 708
Amounts paid during the year ended December 31, 2017	(353)
Amounts accrued at December 31, 2017	355
Employee Severance, Benefits and Related Costs [Member]
Restructuring Cost And Reserve [Line Items]
Expense incurred during the year ended December 31, 2017	412
Amounts paid during the year ended December 31, 2017	(340)
Amounts accrued at December 31, 2017	72
Obligations under Manufacturing and Development Contracts [Member]
Restructuring Cost And Reserve [Line Items]
Expense incurred during the year ended December 31, 2017	296
Amounts paid during the year ended December 31, 2017	(13)
Amounts accrued at December 31, 2017	$ 283

Restructuring expense incurred.

No definition available.

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Balance Type:	debit
Period Type:	duration

- Definition

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585

+ Details

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Period Type:	duration

- 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.

+ Details

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- Definition

Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB TOPIC 5.P.4(b))
-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

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- Details

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