Segment, Customer Concentration and Geographical Information - Additional Information (Detail)	3 Months Ended		6 Months Ended
	Jun. 30, 2021 Customer Location	Jun. 30, 2020 Customer Location	Jun. 30, 2021 Customer Business_Unit Location	Jun. 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	3	3	3	3
Customer Concentration Risk | Revenues [Member] | Two Customer [Member]
Revenue, Major Customer [Line Items]
Concentration percentage	82.00%		79.00%
Customer Concentration Risk | Revenues [Member] | One Customer [Member]
Revenue, Major Customer [Line Items]
Concentration percentage		86.00%		89.00%
Customer Concentration Risk | Accounts Receivable [Member] | Three Customer [Member]
Revenue, Major Customer [Line Items]
Concentration percentage			86.00%
Customer Concentration Risk | Accounts Receivable [Member] | One Customer [Member]
Revenue, Major Customer [Line Items]
Concentration percentage				83.00%
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%