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Summary of Significant Accounting Policies - Additional Information (Detail) |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 02, 2017 USD ($) | Jul. 21, 2016 | Jul. 19, 2016 | Jun. 13, 2016 USD ($) | Jun. 06, 2016 USD ($) | Dec. 31, 2016 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) Segment | Sep. 30, 2017 USD ($) | Jun. 30, 2016 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum period of investments with original maturities from date of acquisition to be cash equivalents |  |  |  |  |  |  |  | 3 months |  |
Reverse stock split ratio |  | 0.0625 |  |  |  |  |  |  |  |
Number of business segments | Segment |  |  |  |  |  |  |  | 1 |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  |  |  |  | 3 years |  |
Reverse stock split ratio |  |  | 0.1 |  |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  |  |  |  | 7 years |  |
Reverse stock split ratio |  |  | 0.05 |  |  |  |  |  |  |
Series C Warrants [Member] |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of notes available for general corporate purposes |  |  |  |  | $ 2,100,000 |  |  |  |  |
Senior Secured Convertible Notes [Member] |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, principal face amount |  |  |  | $ 35,000,000 |  | $ 34,351,000 |  | $ 34,351,000 | $ 11,437,000 | $ 35,000,000
Senior Secured Convertible Notes [Member] | Series C Warrants [Member] |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, principal face amount |  |  |  |  |  |  |  |  |  | $ 35,000,000
Senior Secured Convertible Notes [Member] | Securities Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, principal face amount |  |  |  | 35,000,000 | 35,000,000 |  |  |  |  |
Cash proceeds from notes held |  |  |  | 29,200,000 |  | 26,200,000 |  | 26,200,000 |  |
Proceeds from issuance of notes available for general corporate purposes | $ 3,000,000 |  |  | 3,000,000 | 3,000,000 | 3,000,000 | $ 6,600,000 |  |  |
Senior Secured Convertible Notes [Member] | Securities Purchase Agreement [Member] | Series C Warrants [Member] |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of notes |  |  |  | 32,200,000 | $ 32,200,000 |  |  |  |  |
Senior Secured Convertible Notes [Member] | Securities Purchase Agreement [Member] | First Release Date on December 29, 2016 [Member] |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Cash proceeds from notes held |  |  |  | 3,000,000 |  |  |  |  |  |
Senior Secured Convertible Notes [Member] | Securities Purchase Agreement [Member] | Subsequent Release Dates Beginning in February 2017 [Member] |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Cash proceeds from notes held |  |  |  | $ 26,200,000 |  | $ 26,200,000 |  | $ 26,200,000 |  |

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