Discontinued Operations - Components Included in Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Less:    
Current assets of discontinued operations $ 0 $ 1,070
Disposal Group, Including Discontinued Operation, Assets, Noncurrent [Abstract]    
Non-current assets of discontinued operations $ 0 73
Discontinued operations, disposed of by means other than sale | EFLS    
Less:    
Cash and cash equivalents   93
Trade accounts receivable, net   312
Inventories   0
Prepaid and other current assets   7
Current assets of discontinued operations   412
Disposal Group, Including Discontinued Operation, Assets, Noncurrent [Abstract]    
Property and equipment, net   0
Other assets   0
Non-current assets of discontinued operations   0
Total assets of discontinued operations   412
Plus:    
Accounts payable   163
Accrued liabilities   73
Billings in excess of costs and estimated earnings on uncompleted contracts   23
Current liabilities of discontinued operations   259
Total liabilities of discontinued operations   259
Discontinued operations, disposed of by sale | CLL    
Less:    
Cash and cash equivalents   4
Trade accounts receivable, net   145
Inventories   414
Prepaid and other current assets   95
Current assets of discontinued operations   658
Disposal Group, Including Discontinued Operation, Assets, Noncurrent [Abstract]    
Property and equipment, net   23
Other assets   50
Non-current assets of discontinued operations   73
Total assets of discontinued operations   731
Plus:    
Accounts payable   318
Accrued liabilities   362
Billings in excess of costs and estimated earnings on uncompleted contracts   0
Current liabilities of discontinued operations   680
Total liabilities of discontinued operations   680
Discontinued operations    
Less:    
Cash and cash equivalents   97
Trade accounts receivable, net   457
Inventories   414
Prepaid and other current assets   102
Current assets of discontinued operations   1,070
Disposal Group, Including Discontinued Operation, Assets, Noncurrent [Abstract]    
Property and equipment, net   23
Other assets   50
Non-current assets of discontinued operations   73
Total assets of discontinued operations   1,143
Plus:    
Accounts payable   481
Accrued liabilities   435
Billings in excess of costs and estimated earnings on uncompleted contracts   23
Current liabilities of discontinued operations   939
Total liabilities of discontinued operations   $ 939