Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.1
Concentration of Credit Risk, Significant Customers and Geographic Information (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Concentration Risk [Line Items]      
Net revenue $ 84,635 $ 110,827  
Net Revenue [Member]      
Concentration Risk [Line Items]      
Concentration risk percentage 100.00% 100.00%  
Net revenue $ 84,635 $ 110,827  
Net Revenue [Member] | Asia [Member]      
Concentration Risk [Line Items]      
Concentration risk percentage 85.00% 77.00%  
Net revenue $ 71,548 $ 84,814  
Net Revenue [Member] | UNITED STATES      
Concentration Risk [Line Items]      
Concentration risk percentage 5.00% 5.00%  
Net revenue $ 4,352 $ 5,195  
Net Revenue [Member] | Rest of World [Member]      
Concentration Risk [Line Items]      
Concentration risk percentage 10.00% 19.00%  
Net revenue $ 8,735 $ 20,818  
Net Revenue [Member] | Geographic Concentration Risk [Member] | China [Member]      
Concentration Risk [Line Items]      
Concentration risk percentage 67.00% 61.00%  
Long lived assets [Member]      
Concentration Risk [Line Items]      
Concentration risk percentage 100.00%   100.00%
Long lived assets $ 507,494   $ 501,634
Long lived assets [Member] | UNITED STATES      
Concentration Risk [Line Items]      
Concentration risk percentage 85.00%   85.00%
Long lived assets $ 430,879   $ 426,321
Long lived assets [Member] | Rest of World [Member]      
Concentration Risk [Line Items]      
Concentration risk percentage 1.00%   1.00%
Long lived assets $ 6,326   $ 3,368
Long lived assets [Member] | SINGAPORE      
Concentration Risk [Line Items]      
Concentration risk percentage 14.00%   14.00%
Long lived assets $ 70,289   $ 71,945
Vendor A [Member] | Supplier Concentration Risk [Member]      
Concentration Risk [Line Items]      
Concentration risk percentage 19.00% 14.00%  
Vendor B [Member] | Supplier Concentration Risk [Member]      
Concentration Risk [Line Items]      
Concentration risk percentage 14.00% 19.00%  
Vendor C [Member] | Supplier Concentration Risk [Member]      
Concentration Risk [Line Items]      
Concentration risk percentage 13.00% 16.00%  
Vendor E [Member] | Supplier Concentration Risk [Member]      
Concentration Risk [Line Items]      
Concentration risk percentage   21.00%  
Customer A [Member] | Net Revenue [Member] | Customer Concentration Risk [Member]      
Concentration Risk [Line Items]      
Concentration risk percentage 12.00% 27.00%  
Customer B [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]      
Concentration Risk [Line Items]      
Concentration risk percentage     10.00%
Customer C [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]      
Concentration Risk [Line Items]      
Concentration risk percentage 11.00%