Discontinued Operations (Tables)
 12 Months Ended
Dec. 31, 2016
Discontinued Operations and Disposal Groups [Abstract]  
Schedule of reconciliation of major line items constituting pretax loss of discontinued operations to the after-tax loss of discontinued operations presented in condensed consolidated statements of operations
    Years ended December 31,  
(in thousands)  

2016

    

2015

  
Major line items constituting pretax loss of discontinued operations:                
Net revenue   $ 394     $ 939  
Cost of goods sold     (90 )     1,061  
Expenses:                
Selling and operating     (75 )     644  
General and administrative     25       119  
Restructuring costs     —       31  
Depreciation and amortization     —       56  
Goodwill and other asset impairments     —       —  
Pretax (loss) gain of discontinued operations   $ 534     $ (972 )
Income tax benefit     32       —  
(Loss) gain on discontinued operations   $ 502     $ (972 )
Schedule of reconciliation of the carrying amounts of major classes of assets and liabilities of the discontinued operations to the total assets and liabilities of the discontinued operations presented separately in the condensed consolidated balance sheets
(in thousands)   December 31,
2016		     December 31,
2015		  
Carrying amounts of major classes of assets included as part of discontinued operations:                
Current assets:                
Accounts receivable, net   $ 536     $ 1,560  
Costs in excess of billings on uncompleted contracts     207       1,105  
Inventory, net     37       112  
Deferred costs on uncompleted contracts     —       —  
Other current assets     129       76  
Total major classes of current assets of the discontinued operations     909       2,853  
Noncurrent assets:                
Property and equipment, net     —       —  
Other noncurrent assets     1,252       878  
Total noncurrent assets of discontinued operations     1,252       878  
Total assets of the discontinued operations in the balance sheet   $ 2,161     $ 3,731  
Carrying amounts of major classes of liabilities included as part of discontinued operations:                
Current liabilities:                
Accounts payable     285       1,978  
Accrued liabilities     1,059       2,394  
Billings in excess of costs on uncompleted contracts     —       —  
Deferred revenue and other current liabilities     113       138  
Total current liabilities of discontinued operations     1,457       4,510  
Noncurrent liabilities:                
Other liabilities     225       225  
Total major classes of noncurrent liabilities of the discontinued operations     225       225  
Total liabilities of the discontinued operations in the balance sheet   $ 1,682     $ 4,735