Quarterly report pursuant to Section 13 or 15(d)

Concentration of Credit Risk, Significant Customers and Geographic Information (Details)

v3.20.1
Concentration of Credit Risk, Significant Customers and Geographic Information (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Concentration Risk [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax $ 62,027 $ 84,635  
Net Revenue [Member]      
Concentration Risk [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax $ 62,027 $ 84,635  
Concentration risk percentage 100.00% 100.00%  
Net Revenue [Member] | Asia [Member]      
Concentration Risk [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax $ 52,035 $ 71,548  
Concentration risk percentage 84.00% 85.00%  
Net Revenue [Member] | UNITED STATES      
Concentration Risk [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax $ 1,616 $ 4,352  
Concentration risk percentage 3.00% 5.00%  
Net Revenue [Member] | Rest of World [Member]      
Concentration Risk [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax $ 8,376 $ 8,735  
Concentration risk percentage 13.00% 10.00%  
Net Revenue [Member] | Geographic Concentration Risk [Member] | China [Member]      
Concentration Risk [Line Items]      
Concentration risk percentage   22.00%  
Net Revenue [Member] | Geographic Concentration Risk [Member] | HONG KONG      
Concentration Risk [Line Items]      
Concentration risk percentage 50.00% 45.00%  
Long lived assets [Member]      
Concentration Risk [Line Items]      
Concentration risk percentage 100.00%   100.00%
Long lived assets $ 437,515   $ 453,892
Long lived assets [Member] | UNITED STATES      
Concentration Risk [Line Items]      
Concentration risk percentage 85.00%   85.00%
Long lived assets $ 371,947   $ 385,302
Long lived assets [Member] | Rest of World [Member]      
Concentration Risk [Line Items]      
Concentration risk percentage 1.00%   1.00%
Long lived assets $ 4,247   $ 5,034
Long lived assets [Member] | SINGAPORE      
Concentration Risk [Line Items]      
Concentration risk percentage 14.00%   14.00%
Long lived assets $ 61,321   $ 63,556
Customer B [Member] | Net Revenue [Member] | Customer Concentration Risk [Member]      
Concentration Risk [Line Items]      
Concentration risk percentage 10.00% 12.00%  
Customer B [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]      
Concentration Risk [Line Items]      
Concentration risk percentage 19.00%    
Customer A [Member] | Net Revenue [Member] | Customer Concentration Risk [Member]      
Concentration Risk [Line Items]      
Concentration risk percentage 18.00%    
Customer C [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]      
Concentration Risk [Line Items]      
Concentration risk percentage 11.00%   10.00%
Vendor A [Member] | Supplier Concentration Risk [Member]      
Concentration Risk [Line Items]      
Concentration risk percentage 19.00%    
Vendor B [Member] | Supplier Concentration Risk [Member]      
Concentration Risk [Line Items]      
Concentration risk percentage 18.00% 13.00%  
Vendor C [Member] | Supplier Concentration Risk [Member]      
Concentration Risk [Line Items]      
Concentration risk percentage 17.00%    
Vendor D [Member] | Supplier Concentration Risk [Member]      
Concentration Risk [Line Items]      
Concentration risk percentage 16.00% 14.00%  
Vendor E [Member] | Supplier Concentration Risk [Member]      
Concentration Risk [Line Items]      
Concentration risk percentage   19.00%