Nature of Business, Liquidity, Basis of Presentation and Summary of Significant Accounting Policies - Concentration of Risk (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Asia Pacific | Sales Revenue, Net | Geographic Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	37.00%	33.00%
The Southern Company | Sales Revenue, Net | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage		27.00%
SK E&C | Sales Revenue, Net | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	36.00%	32.00%
Duke Energy | Sales Revenue, Net | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	31.00%
Costco Wholesale Company | Sales Revenue, Net | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage		12.00%
Costco Wholesale Company | Accounts Receivable | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	8.00%		19.00%
The Kraft Company | Accounts Receivable | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage			17.00%