Concentration of Credit Risk (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Net accounts receivable | Customer concentration | Company A
Concentration Risk [Line Items]
Risk concentration	11.00%		11.00%
Total revenue | Customer concentration | Company A
Concentration Risk [Line Items]
Risk concentration	12.00%
Total revenue | Customer concentration | Company B
Concentration Risk [Line Items]
Risk concentration		19.00%
Financial institution A | Cash and cash equivalents | Concentration of credit risk
Concentration Risk [Line Items]
Risk concentration	76.00%		73.00%
Financial institution B | Cash and cash equivalents | Concentration of credit risk
Concentration Risk [Line Items]
Risk concentration	12.00%		18.00%