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