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Debt and Credit Facilities (Details Textual)
1 Months Ended 3 Months Ended 12 Months Ended 24 Months Ended
Dec. 31, 2011
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Sep. 15, 2022
D
Oct. 11, 2017
USD ($)
$ / shares
Sep. 25, 2017
USD ($)
$ / shares
Dec. 31, 2016
USD ($)
Credit Facilities [Line Items]              
Amount over estimated fair value of the liability component     $ 8,377,000        
Convertible Senior Notes due 2022              
Credit Facilities [Line Items]              
Convertible Senior Notes due 2022, aggregate principal     $ 46,000,000   $ 6,000,000.0 $ 40,000,000  
Interest rate     5.50%     5.50%  
Proceeds received     $ 43,000,000        
Conversion ratio   157.5101          
Conversion price | $ / shares           $ 6.35  
Conversion premium, percent         29.00% 27.00%  
Stock price (in dollars per share) | $ / shares         $ 4.94 $ 5.00  
Initial purchaser's discount     $ 2,500,000        
Initial purchaser's discount, percent     5.50%        
Discount rate   12.00%          
Amount over estimated fair value of the liability component     $ 8,500,000        
Transaction costs     $ 500,000        
Transaction costs allocated to equity   $ 100,000          
Effective interest rate     12.20%        
Maxwell SA auto leases | Financing Agreements | Vehicles              
Credit Facilities [Line Items]              
Repayment period     3 years        
Vehicle Financing Agreement              
Credit Facilities [Line Items]              
Borrowings outstanding under vehicle financing agreements     $ 115,000       $ 83,000
Vehicle Financing Agreement | Minimum              
Credit Facilities [Line Items]              
Interest rate     0.90%        
Vehicle Financing Agreement | Maximum              
Credit Facilities [Line Items]              
Interest rate     1.90%        
Revolving Credit Facility | LIBOR              
Credit Facilities [Line Items]              
Debt instrument, variable rate 2.25%            
Secured Debt | Equipment Term Loan              
Credit Facilities [Line Items]              
Eligible equipment purchase, percentage 80.00%            
Debt instrument, amount borrowed $ 5,000,000            
East West Bank | Revolving Credit Facility              
Credit Facilities [Line Items]              
Revolving line of credit     $ 25,000,000.0        
Amount available revolving credit facility     $ 13,300,000        
Percentage of equity interests pledged     100.00%        
Annual commitment fee     $ 125,000        
Proceeds from Lines of Credit     $ 0        
East West Bank | Revolving Credit Facility | Minimum              
Credit Facilities [Line Items]              
Unused commitment fee, percentage     0.30%        
East West Bank | Revolving Credit Facility | Maximum              
Credit Facilities [Line Items]              
Unused commitment fee, percentage     0.50%        
East West Bank | Revolving Credit Facility | Prime Rate | Minimum              
Credit Facilities [Line Items]              
Debt instrument, variable rate     0.00%        
East West Bank | Revolving Credit Facility | Prime Rate | Maximum              
Credit Facilities [Line Items]              
Debt instrument, variable rate     0.50%        
East West Bank | Revolving Credit Facility | LIBOR | Minimum              
Credit Facilities [Line Items]              
Debt instrument, variable rate     2.75%        
East West Bank | Revolving Credit Facility | LIBOR | Maximum              
Credit Facilities [Line Items]              
Debt instrument, variable rate     3.25%        
Scenario, Forecast | Convertible Senior Notes due 2022              
Credit Facilities [Line Items]              
Convertible price threshold percentage       130.00%      
Convertible threshold trading days | D       20