Quarterly report pursuant to Section 13 or 15(d)

Customer Concentrations - Additional Information (Detail)

v3.21.1
Customer Concentrations - Additional Information (Detail) - Customer Concentration Risk [Member] - Customer
3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Revenues [Member]      
Concentration Risk [Line Items]      
Number of customers 1 2  
Concentration percentage 69.00% 82.00%  
Accounts Receivable [Member]      
Concentration Risk [Line Items]      
Number of customers 1   4
Concentration percentage 64.00%   92.00%