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Revolving Credit Line - Narrative (Details) - USD ($)
9 Months Ended
Oct. 11, 2018
Apr. 18, 2018
Sep. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]        
Remaining borrowing capacity     $ 0  
Line of Credit | Revolving Credit Facility        
Debt Instrument [Line Items]        
Balance of revolving line of credit     $ 4,825,000 $ 4,900,000
Tenth Business Financing Modification Agreement With Western Alliance Bank | Line of Credit | Revolving Credit Facility        
Debt Instrument [Line Items]        
Change in finance charge, outstanding advances   0.01%    
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    
Debt instrument, allowable borrowings, percentage of eligible accounts receivable (as percent)   85.00%    
Period for eligible accounts receivable   90 days    
Period From February 1, 2018 Through November 30, 2018 | Tenth Business Financing Modification Agreement With Western Alliance Bank | Line of Credit | Revolving Credit Facility        
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 | Line of Credit | Revolving Credit Facility        
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 | Line of Credit | Revolving Credit Facility        
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 | Line of Credit | Revolving Credit Facility        
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 | Line of Credit | Revolving Credit Facility        
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 | Line of Credit | Revolving Credit Facility        
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 | Line of Credit | Revolving Credit Facility        
Debt Instrument [Line Items]        
Maximum percentage of decline in revenue from projected amount (as percent)   25.00%    
Prime Rate | Line of Credit | Revolving Credit Facility        
Debt Instrument [Line Items]        
Basis spread on variable rate     1.00%  
Subsequent Event | Amended and Restated Financing Agreement | Line of Credit | Revolving Credit Facility        
Debt Instrument [Line Items]        
Eligible invoiced receivables, advance rate 85.00%      
Facility fee $ 11,765      
Facility fee percentage 0.25%      
Monthly maintenance fee 0.125%      
Fee in lieu of warrant $ 30,000      
Fee due upon termination 75,000      
Subsequent Event | Amended And Restated Financing Agreement Uninvoiced Eligible Invoices | Line of Credit | Revolving Credit Facility        
Debt Instrument [Line Items]        
Eligible uninvoiced receivables, sub-limit $ 2,500,000      
Eligible uninvoiced receivables, advance rate 75.00%      
Subsequent Event | Prime Rate | Amended and Restated Financing Agreement | Line of Credit | Revolving Credit Facility        
Debt Instrument [Line Items]        
Basis spread on variable rate 1.00%      
Subsequent Event | Prime Rate | Amended And Restated Financing Agreement Uninvoiced Eligible Invoices | Line of Credit | Revolving Credit Facility        
Debt Instrument [Line Items]        
Basis spread on variable rate 2.00%