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Revolving Credit Line - Narrative (Details) - Line of Credit - Revolving Credit Facility - USD ($)
Apr. 18, 2018
Jun. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]      
Balance of revolving line of credit   $ 4,000,000 $ 4,900,000
Tenth Business Financing Modification Agreement With Western Alliance Bank      
Debt Instrument [Line Items]      
Debt Instrument, Change in Finance Charge, Outstanding Advances, Percent 0.01%    
Bridge Bank – Revolving Credit Line - March 1, 2012 | Bridge Bank, N.A.      
Debt Instrument [Line Items]      
Line of credit facility, maximum borrowing capacity $ 10,000,000    
Debt instrument, allowable borrowings, percentage of eligible accounts receivable (as percent) 85.00%    
Period for eligible accounts receivable 90 days    
Remaining borrowing capacity   $ 2,300,000  
Period From February 1, 2018 Through November 30, 2018 | Tenth Business Financing Modification Agreement With Western Alliance Bank      
Debt Instrument [Line Items]      
Quick ratio (not less than) 0.60    
Period From December 31, 2018 And After | Tenth Business Financing Modification Agreement With Western Alliance Bank      
Debt Instrument [Line Items]      
Quick ratio (not less than) 0.70    
Quarter Ending March 31, 2018 | Tenth Business Financing Modification Agreement With Western Alliance Bank      
Debt Instrument [Line Items]      
Maximum decline in Adjusted EBITDA from projected amount $ 18,000    
Quarter ending June 30, 2018 | Tenth Business Financing Modification Agreement With Western Alliance Bank      
Debt Instrument [Line Items]      
Maximum decline in Adjusted EBITDA from projected amount 57,000    
Quarter Ending September 30, 2018 | Tenth Business Financing Modification Agreement With Western Alliance Bank      
Debt Instrument [Line Items]      
Maximum decline in Adjusted EBITDA from projected amount 191,000    
Quarter Ending December 31, 2018 | Tenth Business Financing Modification Agreement With Western Alliance Bank      
Debt Instrument [Line Items]      
Maximum decline in Adjusted EBITDA from projected amount $ 496,000    
Period From January 1, 2019 and After | Tenth Business Financing Modification Agreement With Western Alliance Bank      
Debt Instrument [Line Items]      
Maximum percentage of decline in revenue from projected amount (as percent) 25.00%