Accounts Receivable - Concentration of Credit Risk (Details) - Customer Concentration Risk	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Revenue from Contract with Customer Benchmark
Concentration Risk [Line Items]
Concentration risk	100.00%	100.00%
Revenue from Contract with Customer Benchmark | Largest customer
Concentration Risk [Line Items]
Concentration risk	48.20%	26.50%
Revenue from Contract with Customer Benchmark | 2nd largest customer
Concentration Risk [Line Items]
Concentration risk	18.20%	25.80%
Revenue from Contract with Customer Benchmark | 3rd largest customer
Concentration Risk [Line Items]
Concentration risk	14.70%	16.20%
Revenue from Contract with Customer Benchmark | 4th largest customer
Concentration Risk [Line Items]
Concentration risk	10.00%	11.50%
Revenue from Contract with Customer Benchmark | Remaining customers
Concentration Risk [Line Items]
Concentration risk	8.90%	20.00%
Accounts Receivable
Concentration Risk [Line Items]
Concentration risk	100.00%		100.00%
Accounts Receivable | Largest customer
Concentration Risk [Line Items]
Concentration risk	37.60%		54.30%
Accounts Receivable | 2nd largest customer
Concentration Risk [Line Items]
Concentration risk	31.90%		15.70%
Accounts Receivable | 3rd largest customer
Concentration Risk [Line Items]
Concentration risk	22.40%		15.20%
Accounts Receivable | 4th largest customer
Concentration Risk [Line Items]
Concentration risk	4.70%		3.60%
Accounts Receivable | Remaining customers
Concentration Risk [Line Items]
Concentration risk	3.40%		11.20%