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Debt and Credit Facilities (Details Textual)
3 Months Ended 12 Months Ended 24 Months Ended
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 15, 2022
D
Feb. 28, 2019
USD ($)
Oct. 11, 2017
USD ($)
$ / shares
Sep. 25, 2017
USD ($)
$ / shares
Credit Facilities [Line Items]              
Amount over estimated fair value of the liability component     $ 8,377,000        
Line of credit borrowings   $ 15,000,000 0        
Equipment purchased under capital leases   $ 1,911,000 0        
Lease term (in years)   3 years          
Discount rate   5.00%          
Lease payment commitments, 2019   $ 500,000          
Lease payment commitments, 2020   700,000          
Lease payment commitments, 2021   400,000          
Convertible Senior Notes due 2022              
Credit Facilities [Line Items]              
Convertible Senior Notes due 2022, aggregate principal   $ 46,000,000 $ 46,000,000     $ 6,000,000 $ 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%          
Vehicle Financing Agreement              
Credit Facilities [Line Items]              
Borrowings outstanding under vehicle financing agreements   $ 1,500,000          
East West Bank | Revolving Credit Facility              
Credit Facilities [Line Items]              
Amount available revolving credit facility   10,500,000          
Annual commitment fee   125,000          
Line of credit borrowings   $ 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 | Revolving Line of Credit, Option A              
Credit Facilities [Line Items]              
Revolving line of credit   $ 25,000,000          
East West Bank | Revolving Credit Facility | Revolving Line of Credit, Option B              
Credit Facilities [Line Items]              
Revolving line of credit   $ 5,000,000          
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      
Subsequent Event | East West Bank | Revolving Credit Facility              
Credit Facilities [Line Items]              
Revolving line of credit         $ 15,000,000.0    
Korean Subsidiary [Member] | East West Bank | Revolving Credit Facility              
Credit Facilities [Line Items]              
Percentage of equity interests pledged   65.00%