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Commitments and Contingencies (Details)
$ in Thousands
3 Months Ended
Jun. 21, 2017
USD ($)
Nov. 30, 2017
USD ($)
claim
Nov. 30, 2016
USD ($)
Aug. 31, 2017
USD ($)
Commitments and Contingencies        
Lease expense related to operating leases   $ 112 $ 112  
Operating lease agreements, description   The Company has several operating leases with unrelated parties, primarily for land, plant and office spaces in Taiwan, which include cancellable and noncancellable leases and which expire at various dates between February 2018 and December 2020.    
Future noncancellable minimum rental payments        
Remainder of 2018   $ 208    
2019   96    
2020   96    
2021   32    
Total   432    
Purchase Obligations        
Purchase commitments for inventory, property, plant and equipment   $ 1,500   $ 1,500
Litigation        
Effective date of purchase agreement   Jul. 06, 2016    
Amount retained for liquidated damages   $ 500    
Pending litigation | claim   0    
Claims From Well Thrive Ltd.        
Litigation        
Litigation settlement amount to be received $ 500      
Minimum        
Commitments and Contingencies        
Cancellable and noncancellable operating lease expiration   2018-02    
Maximum        
Commitments and Contingencies        
Cancellable and noncancellable operating lease expiration   2020-12