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Share-Based Compensation (Details Textual)
$ / shares in Units, $ in Thousands
12 Months Ended
Oct. 06, 2015
$ / shares
shares
Oct. 06, 2015
$ / shares
shares
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2016
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Dec. 31, 2013
USD ($)
$ / shares
shares
Dec. 31, 2013
$ / shares
shares
Dec. 31, 2012
USD ($)
$ / shares
shares
Dec. 31, 2012
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Stock Issued During Period, Shares, Restricted Stock Award, Gross           200,074 191,994   1,390,280          
Excess Tax Deficit from Share-based Compensation | $             $ 142              
Stock Options 2012 Plan [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized                         2,000,000 2,000,000
Stock Option Exercise Price Per Share | (per share)                         $ 1.004 $ 30
Stock Options 2012 Plan [Member] | One And Half Years After Grant Date [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Share Based Compensation Arrangement By Share Based Payment Award Vesting Percentage                         50.00%  
Stock Options 2012 Plan [Member] | Three Years After Grant Date [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Share Based Compensation Arrangement By Share Based Payment Award Vesting Percentage                         50.00%  
Stock Options 2012 Plan [Member] | Imaging Cayman [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Expected term (years)           3 years 1 month 15 days                
Stock Options 2012 Plan [Member] | ROC Central Government Bond [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Expected term (years)             5 years   2 years          
Stock Options 2013 Plan [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized                     430,000 430,000    
Stock Option Exercise Price Per Share | (per share)                     $ 1 $ 30    
Stock Options 2013 Plan [Member] | Half Years After Grant Date [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Share Based Compensation Arrangement By Share Based Payment Award Vesting Percentage                     50.00%      
Stock Options 2013 Plan [Member] | Two Years After Grant Date [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Share Based Compensation Arrangement By Share Based Payment Award Vesting Percentage                     50.00%      
Stock Options 2013 Plan [Member] | Imaging Cayman [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Expected term (years)           2 years 1 month 15 days                
Stock Options 2015 Plan [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 2,528,000 2,528,000                        
Stock Option Exercise Price Per Share | (per share) $ 1.986 $ 65                        
Share-based Compensation Arrangement by Share-based Payment Award Accelerated Compensation Cost | $           $ 307 $ 307   $ 77          
Stock Options 2015 Plan [Member] | One And Half Years After Grant Date [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Share Based Compensation Arrangement By Share Based Payment Award Vesting Percentage           50.00%                
Stock Options 2015 Plan [Member] | Three Years After Grant Date [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Share Based Compensation Arrangement By Share Based Payment Award Vesting Percentage           50.00%                
Stock Options 2015 Plan [Member] | ROC Central Government Bond [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Expected term (years)             2 years   5 years          
Stock Options 2016 Plan [Member] | One And Half Years After Grant Date [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Share Based Compensation Arrangement By Share Based Payment Award Vesting Percentage             50.00%              
Stock Options 2016 Plan [Member] | Three Years After Grant Date [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Share Based Compensation Arrangement By Share Based Payment Award Vesting Percentage             50.00%              
Stock Options 2016 Plan [Member] | Imaging Cayman [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized             1,760,000 1,760,000            
Expected term (years)           3 years 1 month 15 days                
Stock Option Exercise Price Per Share | (per share)             $ 0.9139 $ 30            
Stock Options 2016 Plan [Member] | Imaging Taiwan [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized             2,040,000 2,040,000            
Expected term (years)           3 years 1 month 15 days                
Stock Option Exercise Price Per Share | (per share)             $ 0.9139 $ 30            
Stock Options 2016 Plan [Member] | ROC Central Government Bond [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Expected term (years)             2 years   5 years          
Restricted Stock Units (RSUs) [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Grants In Period           580,235 1,208,785   597,596          
Market Price Per Share Of American Depositary Shares Underlying Restricted Stock Units Granted | $ / shares           $ 10.93 $ 8.30   $ 7.92 $ 9.27 $ 10.15   $ 1.95  
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Share-based Awards Other than Options | $           $ 740                
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition           1 year 9 months 29 days                
Restricted Stock Units (RSUs) [Member] | Long-term Incentive Plan grants 1 [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Grants In Period                         5,522,279  
Share Based Compensation Arrangement By Share Based Payment Award Vesting Percentage                 13.88% 13.88% 13.88%   58.36%  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value | $                         $ 6,286  
Restricted Stock Units (RSUs) [Member] | Long-term Incentive Plan grants 2 [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Grants In Period                     867,771      
Share Based Compensation Arrangement By Share Based Payment Award Vesting Percentage             3.70%   3.70% 3.70% 88.90%      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value | $                     $ 7,833      
Restricted Stock Units (RSUs) [Member] | Long-term Incentive Plan grants 3 [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Grants In Period                   1,219,791        
Share Based Compensation Arrangement By Share Based Payment Award Vesting Percentage           5.81% 5.81%   5.81% 82.57%        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value | $                   $ 9,337        
Restricted Stock Units (RSUs) [Member] | Long-term Incentive Plan grants 4 [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Grants In Period                 597,596          
Share Based Compensation Arrangement By Share Based Payment Award Vesting Percentage           1.95% 1.95%   94.15%          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value | $                 $ 4,456          
Restricted Stock Units (RSUs) [Member] | Long-term Incentive Plan grants 4 [Member] | Scenario, Forecast [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Share Based Compensation Arrangement By Share Based Payment Award Vesting Percentage         1.95%                  
Restricted Stock Units (RSUs) [Member] | Long-term Incentive Plan grants 5 [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Grants In Period             1,208,785              
Share Based Compensation Arrangement By Share Based Payment Award Vesting Percentage           2.69% 91.93%              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value | $             $ 9,223              
Restricted Stock Units (RSUs) [Member] | Long-term Incentive Plan grants 5 [Member] | Scenario, Forecast [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Share Based Compensation Arrangement By Share Based Payment Award Vesting Percentage       2.69% 2.69%                  
Restricted Stock Units (RSUs) [Member] | Long-term Incentive Plan grants 6 [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Grants In Period           580,235                
Share Based Compensation Arrangement By Share Based Payment Award Vesting Percentage           96.91%                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value | $           $ 6,147                
Restricted Stock Units (RSUs) [Member] | Long-term Incentive Plan grants 6 [Member] | Scenario, Forecast [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Share Based Compensation Arrangement By Share Based Payment Award Vesting Percentage     1.03% 1.03% 1.03%