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Debt - Additional Information (Detail) - USD ($) |  |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | ---
Apr. 29, 2015 | Dec. 19, 2014 | Nov. 15, 2013 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Debt Instrument [Line Items] |  |  |  |  |  |  |
Proceeds from additional equity offering (more than) | $ 22,300,000 |  |  |  |  |  |
Non-cash interest expense amortization of debt discount (less than $0.1 million each for Term Loan B and Term Loan C) |  |  |  | $ 100,000 | $ 100,000 | $ 100,000 | $ 200,000
FIrst Warrants | Senior Secured Loan | Hercules Technology Growth Capital |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Number of shares received from warrants received to purchase common stock (in shares) |  | 13,927 |  |  |  |  |
Fair value of warrants issued |  | $ 400,000 |  |  |  |  |
Second Warrants | Senior Secured Loan | Hercules Technology Growth Capital |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Number of shares received from warrants received to purchase common stock (in shares) |  | 25,641 |  |  |  |  |
Fair value of warrants issued |  | $ 200,000 |  |  |  |  |
Hercules Warrants | Senior Secured Loan | Hercules Technology Growth Capital |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Number of shares received from warrants received to purchase common stock (in shares) |  | 58,823 |  |  |  |  |
Warrant exercise price (in dollars per share) | $ 9.41 | $ 11.00 |  |  |  |  |
Term Loan |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest expense, debt |  |  |  | 100,000 | 300,000 | 300,000 | 600,000
Term Loan | Senior Secured Loan | Hercules Technology Growth Capital |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Covenant, unrestricted cash balance requirement |  |  |  | 2,000,000 |  | 2,000,000 |
Term Loan B | Senior Secured Loan | Hercules Technology Growth Capital |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt, face amount |  |  | $ 10,000,000.0 |  |  |  |
Net proceeds from debt |  |  | $ 9,800,000 |  |  |  |
Interest rate, stated percentage |  |  | 11.00% |  |  |  |
Outstanding principal balance |  |  |  | 700,000 |  | 700,000 |
End of term fee |  |  |  |  |  | 500,000 |
Minimum amount of proceeds from specified asset dispositions for mandatory prepayment feature |  |  |  | 1,000,000.0 |  | 1,000,000.0 |
Debt discount |  |  | $ 200,000 |  |  |  |
Term Loan B | Hercules Warrants | Senior Secured Loan | Hercules Technology Growth Capital |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Unamortized discount (premium) and debt issuance costs |  | $ 1,000,000 |  |  |  |  |
Non-cash interest expense amortization of debt discount (less than $0.1 million each for Term Loan B and Term Loan C) |  |  |  | 100,000 | 100,000 | 100,000 |
Term Loan C | Senior Secured Loan | Hercules Technology Growth Capital |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt, face amount |  | 1,500,000.0 |  |  |  |  |
Net proceeds from debt |  | $ 1,400,000 |  |  |  |  |
Interest rate, stated percentage |  | 11.00% |  |  |  |  |
End of term fee |  |  |  |  |  | $ 100,000 |
Debt discount |  |  | $ 100,000 |  |  |  |
Debt instrument, maturity date |  |  |  |  |  | Jun. 01, 2017 |
Proceeds from additional equity offering (more than) |  |  |  | 10,000,000 |  |  |
Term Loan C | Hercules Warrants | Senior Secured Loan | Hercules Technology Growth Capital |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Unamortized discount (premium) and debt issuance costs |  | $ 300,000 |  |  |  |  |
Non-cash interest expense amortization of debt discount (less than $0.1 million each for Term Loan B and Term Loan C) |  |  |  | $ 100,000 | $ 100,000 | $ 100,000 | $ 100,000
Prime Rate | Term Loan B | Senior Secured Loan | Hercules Technology Growth Capital |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, basis spread on prime rate |  |  | 3.75% |  |  |  |
Prime Rate | Term Loan C | Senior Secured Loan | Hercules Technology Growth Capital |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, basis spread on prime rate |  | 3.75% |  |  |  |  |

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