Quarterly report pursuant to Section 13 or 15(d)

Liquidity (Details)

v3.8.0.1
Liquidity (Details) - USD ($)
Sep. 28, 2016
Dec. 31, 2017
May 23, 2017
Debt Instrument [Line Items]      
Cash   $ 7,214,000  
Repayments of debt $ 11,000,000    
Silicon Valley Bank      
Debt Instrument [Line Items]      
Repayments of debt 3,000,000    
North Atlantic Capital      
Debt Instrument [Line Items]      
Repayments of debt 8,000,000    
Convertible notes      
Debt Instrument [Line Items]      
Debt face amount $ 16,000,000 $ 8,632,000  
Interest rate 8.75%    
Proceeds from debt $ 14,316,000    
Credit Agreement | Western Alliance Bank      
Debt Instrument [Line Items]      
Credit agreement, total facility amount     $ 5,000,000