Convertible Notes and Warrants - Additional Information (Detail) | Dec. 01, 2017$ / shares | Jul. 14, 2016USD ($)Investorshares | Apr. 25, 2016USD ($)Investorshares | Apr. 21, 2016USD ($)shares | Sep. 30, 2017USD ($) | Sep. 30, 2016USD ($) | Sep. 30, 2017USD ($) | Sep. 30, 2016USD ($) | Dec. 31, 2016USD ($) |
Debt Instrument [Line Items] | | | | | | | | | |
Aggregate principal amount | | | | | $ 23,000,000 | | $ 23,000,000 | | |
Proceeds from issuance of convertible debt | | | | | | | | $ 3,050,000 | |
Proceeds from related party convertible debt | | | | | | | | 19,950,000 | |
Fair value of the warrants issued | | | | | | | | 662,000 | |
Amortization of financing cost | | | | | 60,000 | | 174,000 | | |
Financing costs, derivative liability and warrant | | | | | | $ 61,000 | | $ 997,000 | |
Other miscellaneous interest expense | | | | | | | 8,000 | | |
Convertible Debt [Member] | Senior Convertible Notes Due 2021 [Member] | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Financing cost | | | | | 2,400,000 | | 2,400,000 | | |
Amortization of financing cost | | | | | | | $ 1,400,000 | | |
Unamortized debt discount remaining amortization period | | | | | | | 3 years 7 months 2 days | | |
Convertible Debt [Member] | Other Accrued Liabilities [Member] | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Accrued interest payable | | | | | 863,000 | | $ 863,000 | | $ 340,000 |
Convertible Debt [Member] | Other Accrued Liabilities [Member] | Senior Convertible Notes Due 2021 [Member] | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Accrued interest payable | | | | | $ 863,000 | | $ 863,000 | | |
Second and Final Closing [Member] | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Amount funded by number of investors | Investor | | 2 | | | | | | | |
Second and Final Closing [Member] | Class of Warrant Issued April 22, 2016 [Member] | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Fair value of the warrants issued | | $ 662,000 | | | | | | | |
Class of warrants or rights, issued | shares | | 259,117 | | | | | | | |
Second and Final Closing [Member] | Convertible Debt [Member] | Senior Convertible Notes Due 2021 [Member] | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Proceeds from issuance of convertible debt | | $ 3,000,000 | | | | | | | |
Effective interest rate on liability component | | | | | 16.24% | | 16.24% | | |
Initial Closing [Member] | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Amount funded by number of investors | Investor | | | 2 | | | | | | |
Initial Closing [Member] | Class of Warrant Issued April 22, 2016 [Member] | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Fair value of the warrants issued | | | $ 11,000 | | | | | | |
Amount funded by number of investors | Investor | | | 1 | | | | | | |
Class of warrants or rights, issued | shares | | | 4,319 | | | | | | |
Initial Closing [Member] | Convertible Debt [Member] | Senior Convertible Notes Due 2021 [Member] | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Proceeds from issuance of convertible debt | | | $ 20,000,000 | | | | | | |
Number of common shares convertible to derivative liability due to Conversion Share Cap | shares | | | 3,319,820 | | | | | | |
Effective interest rate on liability component | | | | | 22.90% | | 22.90% | | |
Initial Closing [Member] | Convertible Debt [Member] | Senior Convertible Notes Due 2021 [Member] | Grifols [Member] | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Proceeds from related party convertible debt | | | $ 19,900,000 | | | | | | |
Private Placement [Member] | Class of Warrant Issued April 22, 2016 [Member] | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Number of shares into which the class of warrant may be converted | shares | | | | 263,436 | | | | | |
Private Placement [Member] | Convertible Debt [Member] | Senior Convertible Notes Due 2021 [Member] | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Aggregate principal amount | | | | $ 23,000,000 | | | | | |
Maturity date | | | | May 1, 2021 | | | | | |
Notes bear interest rate | | | | 9.00% | | | | | |
Frequency of periodic payment of interest | | | | | | | Payable semiannually in arrears on November 1 and May 1 of each year commencing on November 1, 2016. | | |
Scenario, Forecast [Member] | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Number of trading days for effectiveness preceding issuance of redemption notice | 20 days | | | | | | | | |
Redeemable portion of notes equal to percentage of principal amount of notes | 100.00% | | | | | | | | |
Scenario, Forecast [Member] | Minimum [Member] | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Redeemable portion of notes equal to or greater than percentage of sale price of common stock | 200.00% | | | | | | | | |
Scenario, Forecast [Member] | Class of Warrant Issued April 22, 2016 [Member] | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Warrants term | 5 years | | | | | | | | |
Warrants, exercise price | $ / shares | $ 5.21 | | | | | | | | |
Scenario, Forecast [Member] | Convertible Debt [Member] | Senior Convertible Notes Due 2021 [Member] | Minimum [Member] | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Percentage of principal amount of outstanding debt held by trustee or holders, in which they may declare debt to be due and payable immediately in event of default | 25.00% | | | | | | | | |