Quarterly report pursuant to Section 13 or 15(d)

Revenue, Contract Assets and Liabilities and Other Contract Matters - Additional Information (Details)

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Revenue, Contract Assets and Liabilities and Other Contract Matters - Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2023
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Long Term Contracts Or Programs Disclosure [Line Items]          
Recognized income associated with revisions to allowance for doubtful accounts   $ 200   $ 200  
Allowance for doubtful accounts and credit losses     $ 200   $ 200
Increase to beginning accumulated deficit     $ (33,244)   (41,373)
Litigation Settlement, Expense $ 32,500        
Hurricane Ida          
Long Term Contracts Or Programs Disclosure [Line Items]          
Impact of Hurricane Ida, description     During 2021, our operations were impacted by Hurricane Ida, which made landfall near Houma, Louisiana as a high-end Category 4 hurricane, causing debris and damage to our buildings and equipment at our Houma Facilities.    
Insurance payments received     $ 2,000 700  
Gain on interruptions insurance recovery       200  
Insurance receivables         2,000
Forty-Vehicle Ferry          
Long Term Contracts Or Programs Disclosure [Line Items]          
Change in estimated margins   200   200  
Seventy-Vehicle Ferry          
Long Term Contracts Or Programs Disclosure [Line Items]          
Change in estimated margins   600   600  
Remaining Forty-Vehicle Ferry | Hurricane Ida          
Long Term Contracts Or Programs Disclosure [Line Items]          
Total charges related to deductibles   300   300  
Shipyard Division          
Long Term Contracts Or Programs Disclosure [Line Items]          
Reduction of estimated contract price for liquidated damages, amount         $ 1,400
Change in estimated margins   $ 800   $ 800