XML 23 R44.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Debt - Additional Information (Detail) - USD ($)
1 Months Ended
Nov. 30, 2017
Dec. 31, 2019
Dec. 31, 2018
Line of Credit Facility [Line Items]      
Outstanding letters of credit   $ 10,500,000 $ 10,500,000
Revolving Credit Facility      
Line of Credit Facility [Line Items]      
Credit facility $ 20,000,000.0    
Term Loan      
Line of Credit Facility [Line Items]      
Line of credit, outstanding borrowings   $ 0  
Minimum      
Line of Credit Facility [Line Items]      
Unused facility fee, revolving line of credit 0.15%    
Adjusted quick ratio 135.00%    
Minimum | LIBOR      
Line of Credit Facility [Line Items]      
Additional interest rate margin 2.00%    
Minimum | Prime Rate      
Line of Credit Facility [Line Items]      
Additional interest rate margin 1.00%    
Maximum      
Line of Credit Facility [Line Items]      
Unused facility fee, revolving line of credit 0.25%    
Maximum | LIBOR      
Line of Credit Facility [Line Items]      
Additional interest rate margin 2.50%    
Maximum | Prime Rate      
Line of Credit Facility [Line Items]      
Additional interest rate margin 1.50%