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Revolving credit line - Narrative (Details)
Mar. 27, 2017
USD ($)
Mar. 01, 2012
USD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
Debt Instrument [Line Items]        
Debt balance     $ 3,600,000 $ 0
Bridge Bank – Revolving Credit Line - March 1, 2012 | Bridge Bank, N.A. | Line of Credit | Revolving Credit Facility        
Debt Instrument [Line Items]        
Line of credit facility, maximum borrowing capacity $ 10,000,000 $ 10,000,000    
Debt instrument, allowable borrowings, percentage of eligible accounts receivable   80.00%    
Debt instrument, additional borrowing maximum, over eligible accounts receivable limit   $ 1,000,000    
Period for eligible accounts receivable   90 days    
Remaining borrowing capacity     2,900,000  
Debt balance     3,600,000  
Eighth Business Financing Modification Agreement with Western Alliance Bank | Secured Debt | Period from February 1, 2017 through December 31, 2017        
Debt Instrument [Line Items]        
Quick ratio (not less than) 0.65      
Eighth Business Financing Modification Agreement with Western Alliance Bank | Secured Debt | Period from January 1, 2018 and after        
Debt Instrument [Line Items]        
Quick ratio (not less than) 0.75      
Maximum percentage of decline in revenue from projected amount 20.00%      
Eighth Business Financing Modification Agreement with Western Alliance Bank | Secured Debt | Quarter ending March 31, 2017        
Debt Instrument [Line Items]        
Maximum decline in AEBITDA from projected amount $ 300,000      
Maximum percentage of decline in revenue from projected amount 25.00%      
Eighth Business Financing Modification Agreement with Western Alliance Bank | Secured Debt | Quarter ending June 30, 2017        
Debt Instrument [Line Items]        
Maximum decline in AEBITDA from projected amount $ 400,000      
Eighth Business Financing Modification Agreement with Western Alliance Bank | Secured Debt | Quarter ending September 30, 2017        
Debt Instrument [Line Items]        
Maximum decline in AEBITDA from projected amount $ 400,000      
Maximum percentage of decline in revenue from projected amount 25.00%      
Eighth Business Financing Modification Agreement with Western Alliance Bank | Secured Debt | Quarter Ending December 31, 2017 and Thereafter        
Debt Instrument [Line Items]        
Maximum decline in AEBITDA from projected amount $ 400,000      
Maximum percentage of decline in revenue from projected amount 25.00%      
Bridge Bank – Term Note Payable - September 10, 2017 | Term Note Payable        
Debt Instrument [Line Items]        
Debt balance     $ 3,600,000