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Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders' Deficit (Parenthetical) (USD $) In Thousands, unless otherwise specified | 9 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013 | Dec. 31, 2011 | Feb. 29, 2012 | Dec. 31, 2012 | Jan. 31, 2013 | Nov. 30, 2012 | Nov. 30, 2013
Issuance of redeemable convertible preferred stock, issuance costs | $ 2,312 us-gaap_PaymentsOfStockIssuanceCosts | $ 165 us-gaap_PaymentsOfStockIssuanceCosts | $ 196 us-gaap_PaymentsOfStockIssuanceCosts |  |  |  |  |  |
Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |
Issuance of redeemable convertible preferred stock, issuance costs |  |  |  | 9 us-gaap_PaymentsOfStockIssuanceCosts / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |  |
Series C Preferred Stock [Member] |  |  |  |  |  |  |  |  |
Issuance of redeemable convertible preferred stock, issuance costs |  |  |  | 33 us-gaap_PaymentsOfStockIssuanceCosts / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember | 8 us-gaap_PaymentsOfStockIssuanceCosts / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember | 8 us-gaap_PaymentsOfStockIssuanceCosts / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |  |  |
Series D Preferred Stock [Member] |  |  |  |  |  |  |  |  |
Issuance of redeemable convertible preferred stock, issuance costs |  |  | 1 us-gaap_PaymentsOfStockIssuanceCosts / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember |  |  | 54 us-gaap_PaymentsOfStockIssuanceCosts / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember | 1 us-gaap_PaymentsOfStockIssuanceCosts / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember | 54 us-gaap_PaymentsOfStockIssuanceCosts / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember |
Series E Preferred Stock [Member] |  |  |  |  |  |  |  |  |
Issuance of redeemable convertible preferred stock, issuance costs |  |  | $ 156 us-gaap_PaymentsOfStockIssuanceCosts / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember |  |  |  |  |  | $ 156 us-gaap_PaymentsOfStockIssuanceCosts / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember

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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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