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Long-Term Debt (Details) - USD ($)
1 Months Ended 12 Months Ended
Mar. 28, 2016
Feb. 25, 2016
Feb. 16, 2016
Jan. 25, 2016
Apr. 17, 2015
Mar. 30, 2016
Dec. 31, 2015
Dec. 31, 2014
Apr. 16, 2015
Dec. 31, 2013
Dec. 31, 2012
Loan and Security Agreements [Line Items]                      
Cash and cash equivalents             $ 2,035,000 $ 5,201,000   $ 3,970,000 $ 8,319,000
Common stock, par value (in usd per share)             $ 0.04 $ 0.04      
Common stock, value             $ 3,000,000        
Subsequent Event [Member]                      
Loan and Security Agreements [Line Items]                      
Issuance of common stock (shares) 10,000,000     39,026,839              
Common stock, par value (in usd per share) $ 0.04                    
Term Loan [Member]                      
Loan and Security Agreements [Line Items]                      
Loan amount             5,000,000        
2013 Loan and Security Agreement [Member]                      
Loan and Security Agreements [Line Items]                      
Maximum borrowing capacity         $ 7,000,000       $ 10,000,000    
2013 Loan and Security Agreement [Member] | Line of Credit [Member]                      
Loan and Security Agreements [Line Items]                      
Maximum borrowing capacity         $ 7,000,000            
Loan maximum defined, based on eligible receivables (percent)         85.00%            
Borrowings outstanding under Loan and Security Agreement             3,300,000        
Available borrowing capacity under loan             400,000        
Debt covenant, future minimum EBITDA amount, current             $ 800,000.0        
Interest rate, stated percentage             6.00%        
Annual capacity fee             1.00%        
Commitment fee               $ 100,000      
Other issue costs               900,000      
Unused line fee             $ 100,000 $ 200,000      
Deferred financing costs             $ 300,000        
2013 Loan and Security Agreement [Member] | Line of Credit [Member] | Scenario, Period One [Member]                      
Loan and Security Agreements [Line Items]                      
Credit facility - early termination fee (percent)         3.00%            
2013 Loan and Security Agreement [Member] | Line of Credit [Member] | Scenario, Period Two [Member]                      
Loan and Security Agreements [Line Items]                      
Credit facility - early termination fee (percent)         2.00%            
2013 Loan and Security Agreement [Member] | Line of Credit [Member] | Scenario, Period Three [Member]                      
Loan and Security Agreements [Line Items]                      
Credit facility - early termination fee (percent)         1.00%            
2013 Loan and Security Agreement [Member] | Line of Credit [Member] | Prime rate [Member]                      
Loan and Security Agreements [Line Items]                      
Spread on variable rate (percent)             2.75%        
2013 Loan and Security Agreement [Member] | Line of Credit [Member] | LIBOR 90 day rate [Member]                      
Loan and Security Agreements [Line Items]                      
Spread on variable rate (percent)             5.25%        
2013 Loan and Security Agreement [Member] | Line of Credit [Member] | Subsequent Event [Member]                      
Loan and Security Agreements [Line Items]                      
Average remaining borrowing capacity           $ 400,000          
Cash and cash equivalents $ 2,400,000                    
2015 Credit Agreement [Member] | Term Loan [Member]                      
Loan and Security Agreements [Line Items]                      
Deferred financing costs             $ 200,000        
Loan amount         $ 5,000,000            
Origination fee         100,000            
Aggregate revenue-based quarterly payment ceiling         $ 600,000            
Variable interest rate floor (percent)         1.00%            
Exit fee (percent)         8.00%            
Debt covenant, future minimum aggregate revenue covenant amount, current             $ 34,000,000        
2015 Credit Agreement [Member] | Term Loan [Member] | Contingently issuable warrant [Member]                      
Loan and Security Agreements [Line Items]                      
Value of additional warrant to be issued         $ 1,250,000            
2015 Credit Agreement [Member] | Term Loan [Member] | Annual Aggregate Revenue Up To And Including $20 million [Member]                      
Loan and Security Agreements [Line Items]                      
Quarterly revenue-based payments as a percent of annual aggregate revenue (percent)         8.50%            
Annual aggregate revenue         $ 20,000,000            
2015 Credit Agreement [Member] | Term Loan [Member] | Annual Aggregate Revenue Greater Than $20 Million Up To And Including $30 Million [Member]                      
Loan and Security Agreements [Line Items]                      
Quarterly revenue-based payments as a percent of annual aggregate revenue (percent)         7.00%            
2015 Credit Agreement [Member] | Term Loan [Member] | Annual Aggregate Revenue Greater Than $20 Million Up To And Including $30 Million [Member] | Minimum [Member]                      
Loan and Security Agreements [Line Items]                      
Annual aggregate revenue         $ 20,000,000            
2015 Credit Agreement [Member] | Term Loan [Member] | Annual Aggregate Revenue Greater Than $20 Million Up To And Including $30 Million [Member] | Maximum [Member]                      
Loan and Security Agreements [Line Items]                      
Annual aggregate revenue         $ 30,000,000            
2015 Credit Agreement [Member] | Term Loan [Member] | Annual Aggregate Revenue Greater Than $30 million [Member]                      
Loan and Security Agreements [Line Items]                      
Quarterly revenue-based payments as a percent of annual aggregate revenue (percent)         5.00%            
Annual aggregate revenue         $ 30,000,000            
2015 Credit Agreement [Member] | Term Loan [Member] | London Interbank Offered Rate (LIBOR) [Member]                      
Loan and Security Agreements [Line Items]                      
Spread on variable rate (percent)         14.00%            
2015 Credit Agreement [Member] | Term Loan [Member] | Subsequent Event [Member]                      
Loan and Security Agreements [Line Items]                      
Repayment of loan     $ 500,000                
Payment of interest expense     200,000                
Amount of principle payment and interest expense     $ 700,000                
Issuance of common stock (shares)   454,545                  
Common stock, par value (in usd per share) $ 0.04 $ 0.04                  
Common stock, value $ 100,000 $ 50,000