Quarterly report pursuant to Section 13 or 15(d)

Organization and Summary of Significant Accounting Policies - Additional Information (Details)

v3.21.2
Organization and Summary of Significant Accounting Policies - Additional Information (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
segment
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Significant Accounting Policies [Line Items]          
Number of operating segments | segment     2    
Number of corporate non-operating segments | segment     1    
Short-term investments $ 0   $ 0    
Prepaid contract costs 0   0   $ 0
Gain on settlement of contract dispute for project completed in 2015     10,000,000.0    
Federal income tax expense (benefit) 0 $ 0 0 $ 0  
Other (income) expense, net          
Significant Accounting Policies [Line Items]          
Charges for damage 400,000 $ 700,000 $ 400,000 $ 700,000  
Minimum          
Significant Accounting Policies [Line Items]          
Property, plant and equipment, useful life     3 years    
Maximum          
Significant Accounting Policies [Line Items]          
Property, plant and equipment, useful life     25 years    
LC Facility          
Significant Accounting Policies [Line Items]          
Restricted cash 2,100,000   $ 2,100,000   $ 0
LC Facility | Balance Sheet Date Classified as Current          
Significant Accounting Policies [Line Items]          
Maturity date, description     maturity dates of twelve months or less from the balance sheet date classified as current    
LC Facility | Balance Sheet Date Classified as Noncurrent          
Significant Accounting Policies [Line Items]          
Maturity date, description     maturity dates of longer than twelve months from the balance sheet date classified as noncurrent    
PPP Loan          
Significant Accounting Policies [Line Items]          
Nontaxable benefit associated with extinguishment of debt $ 9,100,000   $ 9,100,000