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Description of Business and Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
 1 Months Ended 3 Months Ended
Jun. 23, 2015
Sep. 30, 2014
Aug. 31, 2013
Jun. 30, 2015
Jun. 30, 2014
Mar. 31, 2015
Description Of Business And Summary Of Significant Accounting Policies [Line Items]            
Accumulated deficit       $ (130,786,000)   $ (122,295,000)
Cash flow from operations       $ 6,295,000 $ 3,365,000  
Sale of common stock shares 10,838,750     25,503 60,522  
Gross proceeds from sale of common stock shares $ 46,100,000          
Restricted cash       $ 78,800   78,800
Inventory       69,000   66,000
Obsolete inventory reserve       $ 32,000   31,000
Estimated useful life of the fixed assets       The estimated useful lives of the fixed assets range between three and seven years.    
Impairment of long-lived assets       $ 0    
Revenue recognized under grants       83,000 $ 30,000  
Dilutive effect       $ 0 $ 0  
Common stock equivalents excluded from computing diluted net loss per share       10,200,000 7,800,000  
NIH Research Grants [Member]            
Description Of Business And Summary Of Significant Accounting Policies [Line Items]            
Revenue recognized under grants       $ 74,000    
Revenue recognized under grants   $ 222,000        
Private, Not-for-Profit Organization [Member]            
Description Of Business And Summary Of Significant Accounting Policies [Line Items]            
Revenue recognized under grants       9,000 $ 30,000  
Research and Development Services [Member]            
Description Of Business And Summary Of Significant Accounting Policies [Line Items]            
Deferred revenue       1,452,000   $ 259,000
Research and Development Services [Member] | Up Front Payment Arrangement [Member]            
Description Of Business And Summary Of Significant Accounting Policies [Line Items]            
Deferred revenue       $ 1,000,000    
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       3 years