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Debt - Additional Information (Detail) - USD ($) |  |  | 9 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 19, 2014 | Nov. 15, 2013 | Dec. 31, 2015 | Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2015 | Mar. 16, 2017 | Nov. 01, 2016 | Apr. 30, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amortization of debt discount |  |  |  | $ 156,000 | $ 359,000 | $ 566,000 |  |  |  |  |
Maturity date description |  |  |  | As a result of the Company’s April 2015 equity offering, the Minimum Threshold was reduced to the lesser of $2.0 million or the aggregate outstanding principal balance of the then outstanding term loans. |  |  |  |  |  |  |
Term debt | Hercules Technology Growth Capital | FIrst warrants |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |
Term debt | Hercules Technology Growth Capital | Second warrants |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |
Term debt | Hercules Technology Growth Capital | Hercules warrants |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares received from warrants received to purchase common stock (in shares) | 58,823 |  |  |  |  |  |  |  |  |  |
Exercise price (in dollars per share) | $ 11.00 |  |  | $ 9.38 |  |  |  |  |  |  |
Term loan B | Term debt | Hercules Technology Growth Capital |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt, face amount |  | $ 10,000,000.0 |  |  |  |  |  |  |  |  |
Net proceeds from debt |  | $ 9,800,000 |  |  |  |  |  |  |  |  |
Interest rate on loan |  | 11.00% |  |  |  |  |  |  |  |  |
Debt fee amount |  |  |  |  |  |  |  | $ 500,000 |  |  |
Legal and origination costs recorded as debt discount |  |  |  |  |  |  |  |  |  |  | $ 200,000
Term loan B | Term debt | Hercules Technology Growth Capital | Hercules warrants |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Unamortized discount and debt issuance costs, net | $ 1,000,000 |  |  |  |  |  |  |  |  |  |
Amortization of debt discount |  |  |  | $ 100,000 | 200,000 |  |  |  |  |  |
Term loan B | Term debt | Hercules Technology Growth Capital | Prime rate |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread that exceeds prime rate, percentage |  | 3.75% |  |  |  |  |  |  |  |  |
Term loan C | Term debt | Hercules Technology Growth Capital |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt, face amount | 1,500,000.0 |  |  |  |  |  |  |  |  |  |
Net proceeds from debt | $ 1,400,000 |  |  |  |  |  |  |  |  |  |
Interest rate on loan |  |  |  |  |  |  | 11.25% |  |  |  |
Debt fee amount |  |  |  | 100,000 |  |  |  |  |  |  |
Legal and origination costs recorded as debt discount |  |  |  |  |  |  |  |  |  | $ 100,000 |
Prepayment feature, use of asset proceeds minimum |  |  |  | 1,000,000 |  |  |  |  |  |  |
Proceeds from additional equity offering |  |  | $ 10,000,000 |  |  |  |  |  |  |  |
Term loan C | Term debt | Hercules Technology Growth Capital | Hercules warrants |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Unamortized discount and debt issuance costs, net |  |  |  | 300,000 |  |  |  |  |  |  |
Amortization of debt discount |  |  |  | 100,000 | 100,000 |  |  |  |  |  |
Term loan |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amortization of debt discount |  |  |  | 200,000 | 400,000 | 500,000 |  |  |  |  |
Interest expense, debt |  |  |  | 400,000 | $ 1,000,000 | $ 1,700,000 |  |  |  |  |
Term loan | Term debt | Hercules Technology Growth Capital |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Covenant terms, unrestricted cash balance requirement, minimum |  |  |  | $ 1,500,000.0 |  |  |  |  |  |  |
Maximum | Term loan | Term debt | Hercules Technology Growth Capital |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Covenant terms, unrestricted cash balance requirement, minimum |  |  |  |  |  |  |  |  | $ 2,000,000.0 |  |

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