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Common Stock Equivalents Included In Calculation of Diluted Net Income (Loss) Per Share (Detail) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012 | Dec. 31, 2011
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Common stock equivalents included in calculation of diluted net income (loss) per share | 20,445,061 | 20,334,703 | 0 | 0
Series A-1 Convertible Preferred Stock [Member] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Common stock equivalents included in calculation of diluted net income (loss) per share | 2,156,114 | 2,156,114 |  |
Series A-2 Convertible Preferred Stock [Member] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Common stock equivalents included in calculation of diluted net income (loss) per share | 392,274 | 392,274 |  |
Series B Convertible Preferred Stock [Member] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Common stock equivalents included in calculation of diluted net income (loss) per share | 4,336,037 | 4,336,037 |  |
Series C Convertible Preferred Stock [Member] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Common stock equivalents included in calculation of diluted net income (loss) per share | 5,909,906 | 5,909,906 |  |
Series D Convertible Preferred Stock [Member] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Common stock equivalents included in calculation of diluted net income (loss) per share | 769,468 | 769,468 |  |
Series D-2 Convertible Preferred Stock [Member] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Common stock equivalents included in calculation of diluted net income (loss) per share | 3,391,991 | 3,391,991 |  |
Warrant [Member] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Common stock equivalents included in calculation of diluted net income (loss) per share | 180,784 | 180,784 |  |
Stock Options [Member] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Common stock equivalents included in calculation of diluted net income (loss) per share | 2,910,952 | 3,276,516 |  |

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- Definition The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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