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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