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Subsequent Events - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 9 Months Ended | 12 Months Ended | 1 Months Ended | 0 Months Ended | 1 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Nov. 30, 2013 | Jun. 05, 2014 | Feb. 28, 2014
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Redeemable convertible preferred stock, issued | 0 us-gaap_TemporaryEquitySharesIssued |  | 94,483,404 us-gaap_TemporaryEquitySharesIssued | 73,991,017 us-gaap_TemporaryEquitySharesIssued |  |  |  |
Proceeds from issuance of redeemable convertible preferred stock | $ 442 us-gaap_ProceedsFromIssuanceOfRedeemableConvertiblePreferredStock | $ 5,955 us-gaap_ProceedsFromIssuanceOfRedeemableConvertiblePreferredStock | $ 40,799 us-gaap_ProceedsFromIssuanceOfRedeemableConvertiblePreferredStock | $ 16,057 us-gaap_ProceedsFromIssuanceOfRedeemableConvertiblePreferredStock | $ 10,069 us-gaap_ProceedsFromIssuanceOfRedeemableConvertiblePreferredStock |  |  |
Redeemable convertible preferred stock, issuance cost | 2,312 us-gaap_PaymentsOfStockIssuanceCosts | 165 us-gaap_PaymentsOfStockIssuanceCosts | 196 us-gaap_PaymentsOfStockIssuanceCosts |  |  |  |  |
Series E Preferred Stock [Member] |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Redeemable convertible preferred stock, issued |  |  | 16,110,473 us-gaap_TemporaryEquitySharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember |  |  | 16,110,473 us-gaap_TemporaryEquitySharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember |  |
Redeemable convertible preferred stock, issuance price |  |  | $ 2.1725 us-gaap_SharesIssuedPricePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember |  |  | $ 2.1725 us-gaap_SharesIssuedPricePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember |  |
Proceeds from issuance of redeemable convertible preferred stock |  |  |  |  |  | 35,000 us-gaap_ProceedsFromIssuanceOfRedeemableConvertiblePreferredStock / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember |  |
Redeemable convertible preferred stock, issuance cost |  |  | 156 us-gaap_PaymentsOfStockIssuanceCosts / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember |  |  | 156 us-gaap_PaymentsOfStockIssuanceCosts / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Redeemable convertible preferred stock, conversion ratio |  |  |  |  |  |  | 1-for-6.28 |
Subsequent Event [Member] | Series E Preferred Stock [Member] |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Redeemable convertible preferred stock, issued |  |  |  |  |  |  |  | 204,101 us-gaap_TemporaryEquitySharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Redeemable convertible preferred stock, issuance price |  |  |  |  |  |  |  | $ 2.1725 us-gaap_SharesIssuedPricePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Proceeds from issuance of redeemable convertible preferred stock |  |  |  |  |  |  |  | 443 us-gaap_ProceedsFromIssuanceOfRedeemableConvertiblePreferredStock / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Redeemable convertible preferred stock, issuance cost |  |  |  |  |  |  |  | $ 1 us-gaap_PaymentsOfStockIssuanceCosts / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

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- Definition The cash outflow for cost incurred directly with the issuance of an equity security. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition Describe the conversion features of preferred stock if preferred stock is convertible. That is, shares of preferred stock into which another convertible security was converted, or shares of preferred stock into which another class of preferred stock was converted. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 + Details
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- Definition The cash inflow from issuance of callable preferred stock which is identified as being convertible to another type of financial security at the option of the issuer or the holder. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition Amount per share or per unit of equity securities issued by non-development stage entity. + References No definition available. + Details
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- Definition The number of securities classified as temporary equity that have been sold (or granted) to the entity's shareholders. Securities issued include securities outstanding and securities held in treasury. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.27(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 28 -Subparagraph b -Article 5 + Details
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- Details
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