Quarterly report pursuant to Section 13 or 15(d)

Significant Customer and Geographic Information (Details)

v3.8.0.1
Significant Customer and Geographic Information (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Concentration Risk [Line Items]      
Long lived assets $ 558,016   $ 575,695
Revenue, Net 110,827 $ 88,841  
Asia [Member]      
Concentration Risk [Line Items]      
Revenue, Net 84,814 84,332  
UNITED STATES      
Concentration Risk [Line Items]      
Long lived assets 468,774   481,638
Revenue, Net 5,195 145  
Rest of World [Member]      
Concentration Risk [Line Items]      
Long lived assets 2,055   1,643
Revenue, Net 20,818 $ 4,364  
SINGAPORE      
Concentration Risk [Line Items]      
Long lived assets $ 87,187   $ 92,414
Long lived assets [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Benchmark Description 1   1
Long lived assets [Member] | UNITED STATES      
Concentration Risk [Line Items]      
Concentration Risk, Benchmark Description 0.84   0.84
Long lived assets [Member] | Rest of World [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Benchmark Description 0   0
Long lived assets [Member] | SINGAPORE      
Concentration Risk [Line Items]      
Concentration Risk, Benchmark Description 0.16   0.16
Net Revenue [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 100.00% 100.00%  
Net Revenue [Member] | Asia [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 77.00% 95.00%  
Net Revenue [Member] | UNITED STATES      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 5.00% 0.00%  
Net Revenue [Member] | Rest of World [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 19.00% 5.00%  
Net Revenue [Member] | Customer Concentration Risk [Member] | Customer A [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 27.00% 31.00%  
Net Revenue [Member] | Geographic Concentration Risk [Member] | China [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 61.00% 78.00%  
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer A [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 10.00%    
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Pegatron Corporation [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage     10.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer B [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 13.00%   17.00%
United Microelectronics Corporation [Member] | Supplier Concentration Risk [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 21.00% 21.00%  
Taiwan Semiconductor Manufacturing Company [Member] | Supplier Concentration Risk [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 19.00% 19.00%  
Globalfoundries [Member] | Supplier Concentration Risk [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 14.00% 17.00%  
Semiconductor Manufacturing International [Member] | Supplier Concentration Risk [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage   15.00%  
Vendor D [Member] | Supplier Concentration Risk [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 16.00% 12.00%