Quarterly report pursuant to Section 13 or 15(d)

Credit Facilities and Debt - Additional Information (Details)

v3.20.2
Credit Facilities and Debt - Additional Information (Details)
6 Months Ended
Apr. 17, 2020
USD ($)
Feb. 28, 2020
Jun. 30, 2020
USD ($)
Line of Credit Facility [Line Items]      
Revolving credit facility     $ 40,000,000.0
Maturity date     Jun. 09, 2021
Financial covenants, minimum current assets to current liabilities ratio     1.25
Financial covenants, minimum net worth     $ 130,000,000.0
Debt instrument, covenant terms percent of proceeds from stock issuance added to net worth requirement (percentage)     100.00%
Cash, cash equivalents, and short-term investments     $ 69,200,000
Financial covenant, maximum funded debt to tangible net worth ratio     0.50
Outstanding borrowings under our Credit Agreement     $ 0
Total outstanding letters of credit     9,800,000
Remaining borrowing capacity on line of credit     30,200,000
Tangible net worth     $ 154,100,000
Current ratio     1.76
Funded debt to tangible net worth ratio     0.13
Surety bonds     $ 371,800,000
Letter of Credit      
Line of Credit Facility [Line Items]      
Stated interest rate (percentage)   2.00%  
Letter of Credit | Prime Rate      
Line of Credit Facility [Line Items]      
Basis spread on variable rate (percentage)     3.25%
Letter of Credit | London Interbank Offered Rate (LIBOR)      
Line of Credit Facility [Line Items]      
Basis spread on variable rate (percentage)   2.00% 0.18%
Revolving Credit Facility      
Line of Credit Facility [Line Items]      
Fees on undrawn borrowings (percentage)   0.40%  
PPP Loan      
Line of Credit Facility [Line Items]      
Maturity date Apr. 17, 2022    
Stated interest rate (percentage) 1.00%    
Unsecured loan amount $ 10,000,000.0    
Payment term description     The PPP Loan matures on April 17, 2022, bears interest at a fixed rate of 1.0 percent per annum and is payable in monthly installments commencing on the earlier of the date on which the amount of loan forgiveness is determined or March 17, 2021.
Prepayment penalties $ 0    
Loan agreement condition terms       • Only amounts expended for Permissible Expenses during the eight-week or 24-week period, as elected by us, following April 17, 2020 (the “Covered Period”) are eligible for loan forgiveness. We have elected an eight-week Covered Period;   • Of the total amount of Permissible Expenses for which forgiveness can be granted, at least 60% must be for payroll costs, or a proportionate reduction of the maximum loan forgiveness amount will occur; and
Minimum percentage of payroll costs for loan forgiveness 60.00%    
Employee compensation reduction minimum percentage 25.00%    
PPP loan proceeds used for permissible expenses, percentage related to payroll costs 94.00%    
Minimum      
Line of Credit Facility [Line Items]      
Cash, cash equivalents, and short-term investments     $ 40,000,000.0
Maximum | Letter of Credit | London Interbank Offered Rate (LIBOR)      
Line of Credit Facility [Line Items]      
Basis spread on variable rate (percentage)     1.00%