Quarterly report pursuant to Section 13 or 15(d)

Customer Concentrations - Additional Information (Detail)

v3.21.2
Customer Concentrations - Additional Information (Detail) - Customer Concentration Risk [Member] - Customer
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Revenues [Member]          
Concentration Risk [Line Items]          
Number of customers 3 2 4 2  
Concentration percentage 64.00% 96.00% 72.00% 85.00%  
Accounts Receivable [Member]          
Concentration Risk [Line Items]          
Number of customers     3   4
Concentration percentage     62.00%   92.00%