Concentrations (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020 item customer	Jun. 30, 2019 customer item	Jun. 30, 2020 customer item	Jun. 30, 2019 customer item	Dec. 31, 2019 item customer
Customer | Revenue
Concentrations
Number of customers | customer	2	3	0	4
Customer | Revenue | Customer One
Concentrations
Concentration risk (as a percent)	11.00%	13.00%		14.00%
Customer | Revenue | Customer Two
Concentrations
Concentration risk (as a percent)	10.00%	12.00%		12.00%
Customer | Revenue | Customer Three
Concentrations
Concentration risk (as a percent)		11.00%		11.00%
Customer | Revenue | Customer Four
Concentrations
Concentration risk (as a percent)				11.00%
Customer | Accounts receivable
Concentrations
Number of customers | customer			2		1
Concentration risk (as a percent)					15.00%
Customer | Accounts receivable | Customer One
Concentrations
Concentration risk (as a percent)			17.00%
Customer | Accounts receivable | Customer Two
Concentrations
Concentration risk (as a percent)			10.00%
Supplier | Purchases
Concentrations
Number of suppliers | item	1	1	1	0
Concentration risk (as a percent)	40.00%	12.00%	36.00%
Supplier | Accounts payables
Concentrations
Number of suppliers | item			3		1
Concentration risk (as a percent)					44.00%
Supplier | Accounts payables | Supplier One
Concentrations
Concentration risk (as a percent)			19.00%
Supplier | Accounts payables | Supplier Two
Concentrations
Concentration risk (as a percent)			18.00%
Supplier | Accounts payables | Supplier Three
Concentrations
Concentration risk (as a percent)			15.00%