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Description of Business and Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) shares in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2014 | Aug. 31, 2013 | Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2015
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Accumulated deficit |  |  | $ (199,317,000) | $ (160,870,000) |
Cash flow from operations |  |  | 29,185,000 | 29,368,000 | $ 19,601,000
Foreign currency translation adjustment |  |  | (11,000) | 0 | 0
Restricted cash |  |  | 127,000 | 79,000 |
Inventory of raw materials, net of reserves |  |  | 467,000 | 206,000 |
Inventory of work-in-process, net of reserves |  |  | 83,000 | 15,000 |
Inventory of finished goods, net of reserves |  |  | $ 0 | 113,000 |
Estimated useful life of the fixed assets |  |  | The estimated useful lives of the fixed assets range between one and seven years. |  |
Impairment of long-lived assets |  |  | $ 0 |  |
Warrants expiration date |  |  | Mar. 31, 2017 |  |
Deferred revenue |  |  | $ 582,000 | 1,110,000 |
Revenue related to research contract |  |  | 1,022,000 | 486,000 | 134,000
Cost of revenues |  |  | 956,000 | 0 | 0
Revenue recognized under grants |  |  | 41,000 | 191,000 | 123,000
Dilutive effect |  |  | $ 0 | $ 0 | $ 0
Common stock equivalents excluded from computing diluted net loss per share |  |  | 12.4 | 10.7 | 8.6
NIH Research Grants Two [Member] |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Revenue recognized under grants | $ 222,000 |  |  |  |
Revenue recognized under grants |  |  | $ 0 | $ 148,000 | $ 74,000
Private, Not-for-Profit Organization [Member] |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Revenue recognized under grants |  |  | 41,000 | 43,000 | 49,000
Research and Development Services [Member] |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Deferred revenue |  |  | 640,000 | 1,110,000 |
Research and Development Services Two [Member] |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Revenue related to research contract |  |  |  |  | 69,000
Research and Development Services Three [Member] |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Revenue related to research contract |  |  |  |  | 41,000
Research and Development Services Four [Member] |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Revenue related to research contract |  |  | 117,000 | 352,000 |
Research and Development Services Five [Member] |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Revenue related to research contract |  |  | 835,000 | 80,000 |
Research and Development Services Six [Member] |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Revenue related to research contract |  |  | 32,000 | $ 50,000 | $ 18,000
Research and Development Services Seven [Member] |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Revenue related to research contract |  |  | 34,000 |  |
Research and Development Services Eight [Member] |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Revenue related to research contract |  |  | $ 3,000 |  |
Maximum [Member] |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Maturity of highly liquid investment |  |  | 90 days |  |
Useful life of fixed assets, range |  |  | 7 years |  |
Maximum [Member] | Private, Not-for-Profit Organization [Member] |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Revenue recognized under grants |  | $ 251,700 |  |  |
Minimum [Member] |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Useful life of fixed assets, range |  |  | 1 year |  |

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