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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 |  | $ 39,000 us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty |  |  |
Proceeds from sale of equipment | 30,000 us-gaap_ProceedsFromSaleOfMachineryAndEquipment |  |  |  |
IPO [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Convertible preferred stock, shares issued upon conversion |  |  |  | 6,826,004 us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_IPOMember | 9,728,237 us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_IPOMember
Affiliated Entity [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Fees recorded offsetting research and development expenses |  |  | $ 84,000 us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember |  |

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- 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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- 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 + Details
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