Annual report pursuant to Section 13 and 15(d)

Liquidity - Additional Information (Detail)

v3.8.0.1
Liquidity - Additional Information (Detail) - USD ($)
Sep. 28, 2016
Mar. 31, 2018
May 23, 2017
Mar. 31, 2017
Liquidity [Line Items]        
Cash   $ 13,051,000    
Repayments $ 11,000,000      
Line of Credit        
Liquidity [Line Items]        
Borrowing capacity     $ 5,000,000  
Convertible Notes Payable        
Liquidity [Line Items]        
Debt face amount $ 16,000,000 $ 5,700,000   $ 16,000,000
Interest rate 8.75%      
Proceeds $ 14,316,000      
Silicon Valley Bank        
Liquidity [Line Items]        
Repayments 3,000,000      
North Atlantic Capital        
Liquidity [Line Items]        
Repayments $ 8,000,000