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Debt and Credit Facilities (Details Textual)
1 Months Ended 3 Months Ended 9 Months Ended 24 Months Ended
May 08, 2018
USD ($)
Oct. 11, 2017
USD ($)
$ / shares
Sep. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
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     $ 89,000 $ 115,000   $ 89,000    
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]                
Amount available under revolving line of credit     $ 16,300,000     $ 16,300,000    
Annual commitment fee amount           125,000    
Borrowings under revolving line of credit     $ 0     $ 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%    
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  
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%