Quarterly report pursuant to Section 13 or 15(d)

Revenue from Contracts with Customers - Summary of Accounts And Notes Receivable And Contract Assets and Liabilities (Details)

v3.10.0.1
Revenue from Contracts with Customers - Summary of Accounts And Notes Receivable And Contract Assets and Liabilities (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Revenue from Contract with Customer [Abstract]      
Contract Assets - current   $ 1,675 $ 973
Contract Assets - noncurrent   0 0
Total contract assets $ 973 1,675 973
Contract Liabilities - current   (904) (641)
Contract Liabilities - noncurrent   (315) (380)
Total contract liabilities (1,021) $ (1,219) $ (1,021)
Change in Contract with Customer, Asset [Roll Forward]      
Contract Assets 973    
Decrease due to recognition of revenue or amortization of cost that was included in the beginning contract balance (281)    
Decrease due to recognition of revenue or amortization of cost for current period (770)    
Increase to deferred revenue or mobilization costs during current period 1,753    
Contract Assets 1,675    
Change in Contract with Customer, Liability [Roll Forward]      
Contract Liabilities (1,021)    
Decrease due to recognition of revenue or amortization of cost that was included in the beginning contract balance 910    
Decrease due to recognition of revenue or amortization of cost for current period 0    
Increase to deferred revenue or mobilization costs during current period (1,108)    
Contract Liabilities $ (1,219)