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Debt - Notes Payable (Details)
1 Months Ended 3 Months Ended
Aug. 31, 2018
USD ($)
May 31, 2018
USD ($)
Feb. 28, 2018
USD ($)
Jan. 31, 2018
USD ($)
Nov. 30, 2017
USD ($)
Jul. 31, 2017
USD ($)
Mar. 31, 2019
CNY (¥)
line_of_credit
Mar. 31, 2019
USD ($)
line_of_credit
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]                  
Short-term debt               $ 2,339,000 $ 4,795,000
Notes payable to suppliers | Loans With Suppliers                  
Debt Instrument [Line Items]                  
Short-term debt               2,339,000 4,795,000
Notes payable to suppliers | Loans With Suppliers | Minimum                  
Debt Instrument [Line Items]                  
Debt instrument, term             3 months    
Notes payable to suppliers | Loans With Suppliers | Maximum                  
Debt Instrument [Line Items]                  
Debt instrument, term             6 months    
Loans Payable | First Credit Facility                  
Debt Instrument [Line Items]                  
Current borrowing capacity             ¥ 120,000,000 17,900,000  
Loans Payable | Second Line of Credit                  
Debt Instrument [Line Items]                  
Current borrowing capacity             30,000,000 4,500,000  
Bankers Acceptance                  
Debt Instrument [Line Items]                  
Restricted cash and investments, current               2,600,000 2,600,000
Bankers Acceptance | First Credit Facility                  
Debt Instrument [Line Items]                  
Current borrowing capacity             ¥ 240,000,000 35,800,000  
Percentage of compensating balance requirement for bank acceptance drafts             50.00%    
Bankers Acceptance | Second Line of Credit                  
Debt Instrument [Line Items]                  
Percentage of compensating balance requirement for bank acceptance drafts             50.00%    
Bankers Acceptance | Loans With Suppliers                  
Debt Instrument [Line Items]                  
Short-term debt               2,300,000 $ 4,800,000
Short Term Loans | Second Line of Credit                  
Debt Instrument [Line Items]                  
Current borrowing capacity             ¥ 60,000,000 $ 8,900,000  
Notes Payable to Banks | Notes Payable CITIC Bank                  
Debt Instrument [Line Items]                  
Proceeds from lines of credit     $ 17,000,000     $ 17,000,000      
Debt instrument, interest rate, stated percentage     4.70%            
Repayments of lines of credit $ 17,000,000                
Debt instrument, basis spread           2.55%      
China | Notes payable to suppliers | First Credit Facility                  
Debt Instrument [Line Items]                  
Proceeds from lines of credit         $ 17,000,000        
Repayments of lines of credit   $ 17,000,000              
China | Bankers Acceptance | First Credit Facility                  
Debt Instrument [Line Items]                  
Debt instrument, interest rate, stated percentage         4.10%        
China | Notes Payable to Banks | Notes Payable CITIC Bank                  
Debt Instrument [Line Items]                  
Repayments of lines of credit       $ 17,000,000          
Line of Credit | China                  
Debt Instrument [Line Items]                  
Number of debt instruments | line_of_credit             2 2  
CITIC Bank | Line of Credit | China                  
Debt Instrument [Line Items]                  
Credit facility, maximum borrowing amount             ¥ 250,000,000 $ 37,200,000  
CITIC Bank | Bank Acceptance Drafts | China                  
Debt Instrument [Line Items]                  
Percentage of compensating balance requirement for bank acceptance drafts             36.00%    
Credit facility, maximum borrowing amount             ¥ 390,600,000.0 $ 58,200,000.0