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Convertible Notes Payable - Summary of Common Stock Shares Issued under Notes (Parenthetical) (Detail) - USD ($) |  |  |  |  |  |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 28, 2017 | Aug. 04, 2017 | Jul. 07, 2017 | Jul. 02, 2017 | May 09, 2017 | Apr. 10, 2017 | Mar. 13, 2017 | Mar. 02, 2017 | Feb. 10, 2017 | Feb. 01, 2017 | Jan. 12, 2017 | Sep. 30, 2017 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in Principal | $ 23,563,014 | $ 1,015,848 | $ 2,000,000 |  | $ 1,913,915 | $ 3,621,286 | $ 4,417,830 | $ 126,000 | $ 3,045,817 | $ 544,000 | $ 1,478,318 |  | $ 26,199,000 | $ 0 | $ 649,000
Loss on debt settlement |  |  |  |  |  |  |  |  |  |  |  | $ 2,952,000 | $ 2,952,000 | $ 0 |
Restructuring Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in Principal | 1,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on debt settlement | $ 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in Principal |  |  |  | $ 4,200,000 |  |  |  |  |  |  |  |  |  |  |
Loss on debt settlement |  |  |  | $ 1,000,000 |  |  |  |  |  |  |  |  |  |  |
Series A Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued |  |  |  | 4,200 |  |  |  |  |  |  |  |  |  |  |
Series A Preferred Stock [Member] | Exchange Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued |  |  |  | 4,200 |  |  |  |  |  |  |  |  |  |  |
Common Stock Issued [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued | 1,418,948 | 38,906 | 114,286 |  | 109,367 | 169,061 | 117,297 | 2,571 | 43,882 | 4,857 | 11,753 |  |  |  |
Common Stock Issued [Member] | Restructuring Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued | 117,171 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock Issued [Member] | Exchange Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued |  |  |  | 689,796 |  |  |  |  |  |  |  |  |  |  |

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