Segment, Customer Concentration and Geographical Information - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2021 Customer Business_Unit Location	Mar. 31, 2020 Customer Location
Revenue, Major Customer [Line Items]
Number of primary business units | Business_Unit	1
Number of customers concentrated | Customer	3	1
Number of geographic locations | Location	3	3
Customer Concentration Risk | Revenues [Member] | Two Customer [Member]
Revenue, Major Customer [Line Items]
Concentration percentage	91.00%
Customer Concentration Risk | Revenues [Member] | One Customer [Member]
Revenue, Major Customer [Line Items]
Concentration percentage		91.00%
Customer Concentration Risk | Accounts Receivable [Member] | Two Customer [Member]
Revenue, Major Customer [Line Items]
Concentration percentage	80.00%
Customer Concentration Risk | Accounts Receivable [Member] | One Customer [Member]
Revenue, Major Customer [Line Items]
Concentration percentage		84.00%
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%