Segment, Customer Concentration and Geographical Information - Additional Information (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2021 Customer Location	Sep. 30, 2020 Customer Location	Sep. 30, 2021 Customer Business_Unit Location	Sep. 30, 2020 Customer Location
Revenue, Major Customer [Line Items]
Number of primary business units | Business_Unit			1
Number of customers concentrated | Customer	2	1	2	1
Number of geographic locations | Location	2	3	2	3
Customer Concentration Risk | Revenues [Member] | Two Customer [Member]
Revenue, Major Customer [Line Items]
Concentration percentage	82.00%		80.00%
Customer Concentration Risk | Revenues [Member] | One Customer [Member]
Revenue, Major Customer [Line Items]
Concentration percentage		76.00%		85.00%
Customer Concentration Risk | Accounts Receivable [Member] | Four Customer [Member]
Revenue, Major Customer [Line Items]
Concentration percentage			92.00%
Customer Concentration Risk | Accounts Receivable [Member] | One Customer [Member]
Revenue, Major Customer [Line Items]
Concentration percentage				91.00%
Customer Concentration Risk | Minimum [Member] | Revenues [Member]
Revenue, Major Customer [Line Items]
Concentration percentage			10.00%
Customer Concentration Risk | Minimum [Member] | Accounts Receivable [Member]
Revenue, Major Customer [Line Items]
Concentration percentage			10.00%