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Correction of Previously Issued Financial Data - Effects of Corrected Calculation of Financial Data (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2015 | Jun. 30, 2015 | Sep. 30, 2014 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |
Net loss attributable to common stockholders | $ (4,932) |  | $ (11,147) |  |  |  | $ (21,631) | $ (21,627)
Net loss per share attributable to common stockholders, basic and diluted | $ (0.34) |  | $ (59.60) |  |  |  | $ (3.69) | $ (115.78)
Weighted average shares used to compute basic and diluted net loss per share attributable to common stockholders | 14,654,427 |  | 187,044 |  |  |  | 5,860,758 | 186,792
Options to Purchase Common Stock [Member] |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |
Potential dilutive securities excluded from computation of diluted net loss per common share |  |  |  |  |  |  | 2,224,270 | 806,015
Convertible Notes and Accrued Interest [Member] |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |
Potential dilutive securities excluded from computation of diluted net loss per common share |  |  |  |  |  |  |  | 5,802,189
Scenario, Previously Reported [Member] |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |
Net loss attributable to common stockholders |  | $ (14,897) |  | $ (6,954) | $ (16,699) | $ (10,481) |  |
Net loss per share attributable to common stockholders, basic and diluted |  | $ (2.66) |  | $ (2.21) | $ (3.79) | $ (3.33) |  |
Weighted average shares used to compute basic and diluted net loss per share attributable to common stockholders |  | 5,608,429 |  | 3,145,521 | 4,401,087 | 3,145,283 |  |
Scenario, Previously Reported [Member] | Options to Purchase Common Stock [Member] |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |
Potential dilutive securities excluded from computation of diluted net loss per common share |  |  |  |  |  | 832,184 |  |
Scenario, Previously Reported [Member] | Convertible Notes and Accrued Interest [Member] |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |
Potential dilutive securities excluded from computation of diluted net loss per common share |  |  |  |  |  | 327,505 |  |
Scenario, Actual [Member] |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |
Net loss attributable to common stockholders |  | $ (14,897) |  | $ (6,954) | $ (16,699) | $ (10,481) |  |
Net loss per share attributable to common stockholders, basic and diluted |  | $ (5.77) |  | $ (37.21) | $ (12.00) | $ (56.15) |  |
Weighted average shares used to compute basic and diluted net loss per share attributable to common stockholders |  | 2,580,144 |  | 186,901 | 1,391,048 | 186,663 |  |
Scenario, Actual [Member] | Options to Purchase Common Stock [Member] |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |
Potential dilutive securities excluded from computation of diluted net loss per common share |  |  |  |  |  | 832,226 |  |
Scenario, Actual [Member] | Convertible Notes and Accrued Interest [Member] |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |
Potential dilutive securities excluded from computation of diluted net loss per common share |  |  |  |  |  | 5,525,341 |  |

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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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