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Debt and Credit Facilities (Details Textual)
1 Months Ended 3 Months Ended 24 Months Ended
May 08, 2018
USD ($)
Oct. 11, 2017
USD ($)
$ / shares
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2017
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     $ 40,000,000
Interest rate     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        
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%        
Vehicle Financing Agreement              
Debt Instrument [Line Items]              
Borrowings outstanding under vehicle financing agreements     $ 109,000 115,000      
Vehicle Financing Agreement | Minimum              
Debt Instrument [Line Items]              
Interest rate     0.90%        
Vehicle Financing Agreement | Maximum              
Debt Instrument [Line Items]              
Interest rate     1.90%        
Repayment period     3 years        
Revolving Credit Facility | East West Bank              
Debt Instrument [Line Items]              
Interest rate     4.75%        
Amount available under revolving line of credit     $ 8,900,000        
Annual commitment fee amount     125,000        
Line of Credit, Current     $ 5,000,000 $ 0      
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%        
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 | Revolving Line of Credit, Option a | East West Bank              
Debt Instrument [Line Items]              
Revolving line of credit $ 25,000,000            
Repayment period 3 years            
Subsequent Event | Revolving Credit Facility | Revolving Line of Credit, Option b | East West Bank              
Debt Instrument [Line Items]              
Revolving line of credit $ 5,000,000            
Swiss Subsidiary | Revolving Credit Facility | East West Bank              
Debt Instrument [Line Items]              
Percentage of equity interests pledged     100.00%        
Korean Subsidiary | Revolving Credit Facility | East West Bank              
Debt Instrument [Line Items]              
Percentage of equity interests pledged     65.00%