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Net Loss Per Share (Details) - shares | 3 Months Ended | 9 Months Ended
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Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Antidilutive Common Stock Equivalents Excluded from Computation of Diluted Net Loss Per Share |  |  |  |
Anti-dilutive securities excluded from the calculation of diluted net loss per share (in shares) | 1,771,416 | 9,274,809 | 1,771,416 | 9,274,809
Convertible preferred stock |  |  |  |
Antidilutive Common Stock Equivalents Excluded from Computation of Diluted Net Loss Per Share |  |  |  |
Anti-dilutive securities excluded from the calculation of diluted net loss per share (in shares) |  | 8,012,987 |  | 8,012,987
Options to purchase Common Stock |  |  |  |
Antidilutive Common Stock Equivalents Excluded from Computation of Diluted Net Loss Per Share |  |  |  |
Anti-dilutive securities excluded from the calculation of diluted net loss per share (in shares) | 1,712,011 | 1,214,700 | 1,712,011 | 1,214,700
Warrants for the purchase of Common Stock |  |  |  |
Antidilutive Common Stock Equivalents Excluded from Computation of Diluted Net Loss Per Share |  |  |  |
Anti-dilutive securities excluded from the calculation of diluted net loss per share (in shares) | 59,405 | 34,839 | 59,405 | 34,839
Warrants for the purchase of Preferred Stock |  |  |  |
Antidilutive Common Stock Equivalents Excluded from Computation of Diluted Net Loss Per Share |  |  |  |
Anti-dilutive securities excluded from the calculation of diluted net loss per share (in shares) |  | 12,283 |  | 12,283

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Diluted Earnings Per Share -URI http://asc.fasb.org/extlink&oid=6510752 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Stock Agreement -URI http://asc.fasb.org/extlink&oid=6508534 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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