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Related Party Transactions - Additional Information (Detail) (USD $)	0 Months Ended	12 Months Ended
	Apr. 01, 2014	Dec. 31, 2014	Dec. 31, 2013	Apr. 30, 2014	Apr. 15, 2014
Related Party Transaction [Line Items]
Fees recorded offsetting research and development expenses		$ 39,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
Proceeds from sale of equipment	30,000us-gaap_ProceedsFromSaleOfMachineryAndEquipment
IPO [Member]
Related Party Transaction [Line Items]
Convertible preferred stock, shares issued upon conversion				6,826,004us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_IPOMember	9,728,237us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_IPOMember
Affiliated Entity [Member]
Related Party Transaction [Line Items]
Fees recorded offsetting research and development expenses			$ 84,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember

X

- Definition

Number of shares issued for each share of convertible preferred stock that is converted.

+ References

Reference 1: 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=6928386&loc=d3e21475-112644



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29

-Article 5



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 6

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	instant

X

- Definition

The cash inflow from sale of machinery and equipment.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

+ Details

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Namespace Prefix:	us-gaap_
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Period Type:	duration

X

- Definition

Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 850

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

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- Details

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- Details

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X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: