Annual report pursuant to Section 13 and 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)

v3.19.1
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)
$ in Thousands
1 Months Ended 12 Months Ended
Oct. 10, 2017
segment
Apr. 30, 2018
USD ($)
Nov. 30, 2017
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Equity method investment, ownership percentage         25.00%  
Number of reportable segments | segment 3          
Accounts receivable, net       $ 22,724 $ 26,060  
Percentage of revenue       100.00% 100.00%  
Cash and cash equivalents deposited with financial institutions       $ 4,942 $ 16,156 $ 11,570
Allowance for Doubtful Accounts Receivable, Current       140 1,568  
Reclassification of translation (gain) loss related to sale of foreign subsidiaries       0 (6,622)  
Restricted Cash            
Restricted cash       $ 467 11,562  
Minimum            
Vesting period       1 year    
Maximum            
Product warranty term       2 years    
Vesting period       4 years    
ASU 2016-18            
Net transfers of restricted cash       $ 11,100 2,800  
Collateral for Letter of Credit and Credit Card Obligations            
Restricted Cash            
Restricted cash       500 9,700  
Escrow Deposit For Indemnities Claim            
Restricted Cash            
Restricted cash         1,900  
Westinghouse | Services            
Accounts receivable, net         $ 2,100  
Number of nuclear power plant projects     2   2  
Accounts receivable     $ 8,700      
Cash payment received   $ 2,100 $ 6,400      
Allowance for Doubtful Accounts Receivable, Current         $ 200  
Other Noncurrent Assets            
Equity method investment       800 200  
Equity Method Investee            
Accounts receivable, net       $ 2,100 $ 2,200