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Debt and Credit Facilities (Details Textual)
1 Months Ended 3 Months Ended 6 Months Ended 24 Months Ended
May 08, 2018
USD ($)
Jul. 31, 2018
USD ($)
Oct. 11, 2017
USD ($)
$ / shares
Jun. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Sep. 15, 2022
D
Sep. 25, 2017
USD ($)
$ / shares
Convertible Senior Notes due 2022                  
Debt Instrument [Line Items]                  
Convertible Senior Notes due 2022, aggregate pricncipal     $ 6,000,000 $ 46,000,000 $ 46,000,000   $ 46,000,000   $ 40,000,000
Interest rate       5.50%     5.50%   5.50%
Proceeds received     $ 43,000,000   5,700,000 $ 37,300,000      
Conversion rate       157.5101          
Conversion price | $ / shares                 $ 6.35
Conversion premium, percent     29.00%           27.00%
Share Price | $ / shares     $ 4.94           $ 5.00
Initial purchaser's discount       $ 2,500,000     $ 2,500,000    
Initial purchaser's discount, percent       5.50%     5.50%    
Discount rate       12.00%          
Amount over estimated fair value of the liability component       $ 8,500,000          
Transaction costs       500,000     $ 500,000    
Transaction costs allocated to equity       $ 100,000          
Effective interest rate       12.20%     12.20%    
Vehicle Financing Agreement                  
Debt Instrument [Line Items]                  
Borrowings outstanding under vehicle financing agreements       $ 97,000 115,000   $ 97,000    
Vehicle Financing Agreement | Minimum                  
Debt Instrument [Line Items]                  
Interest rate       0.90%     0.90%    
Vehicle Financing Agreement | Maximum                  
Debt Instrument [Line Items]                  
Interest rate       1.90%     1.90%    
Repayment period             3 years    
Revolving Credit Facility | East West Bank                  
Debt Instrument [Line Items]                  
Interest rate       5.00%     5.00%    
Amount available under revolving line of credit       $ 11,600,000     $ 11,600,000    
Annual commitment fee amount             125,000    
Borrowings under revolving line of credit       $ 5,000,000 $ 0   $ 5,000,000    
Revolving Credit Facility | East West Bank | Minimum                  
Debt Instrument [Line Items]                  
Unused commitment fee percentage             0.30%    
Revolving Credit Facility | East West Bank | Maximum                  
Debt Instrument [Line Items]                  
Unused commitment fee percentage             0.50%    
Revolving Credit Facility | East West Bank | Prime Rate | Minimum                  
Debt Instrument [Line Items]                  
Credit facility interest on borrowings, percentage added to rate             0.00%    
Revolving Credit Facility | East West Bank | Prime Rate | Maximum                  
Debt Instrument [Line Items]                  
Credit facility interest on borrowings, percentage added to rate             0.50%    
Revolving Credit Facility | East West Bank | LIBOR | Minimum                  
Debt Instrument [Line Items]                  
Credit facility interest on borrowings, percentage added to rate             2.75%    
Revolving Credit Facility | East West Bank | LIBOR | Maximum                  
Debt Instrument [Line Items]                  
Credit facility interest on borrowings, percentage added to rate             3.25%    
Revolving Credit Facility | Revolving Line of Credit, Option a | East West Bank                  
Debt Instrument [Line Items]                  
Revolving line of credit $ 25,000,000                
Repayment period 3 years                
Revolving Credit Facility | Revolving Line of Credit, Option b | East West Bank                  
Debt Instrument [Line Items]                  
Revolving line of credit $ 5,000,000                
Scenario, Forecast | Convertible Senior Notes due 2022                  
Debt Instrument [Line Items]                  
Convertible price threshold percentage               130.00%  
Convertible threshold trading days | D               20  
Subsequent Event | Revolving Credit Facility | East West Bank                  
Debt Instrument [Line Items]                  
Revolving line of credit, additional borrowings   $ 10,000,000              
Swiss Subsidiary | Revolving Credit Facility | East West Bank                  
Debt Instrument [Line Items]                  
Percentage of equity interests pledged       100.00%     100.00%    
Korean Subsidiary | Revolving Credit Facility | East West Bank                  
Debt Instrument [Line Items]                  
Percentage of equity interests pledged       65.00%     65.00%