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Summary of Significant Accounting Policies - Schedule of Concentration of Credit Risk (Details) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Clarios (successor of Johnson Controls Battery Group, Inc.) | Revenue |  |  |  |  |
Concentration risk | 0.00% | 59.00% | 100.00% | 59.00% |
Clarios (successor of Johnson Controls Battery Group, Inc.) | Trade Accounts Receivable |  |  |  |  |
Concentration risk |  |  | 0.00% |  | 100.00%
P. Kay Metals | Revenue |  |  |  |  |
Concentration risk | 0.00% | 38.00% | 0.00% | 38.00% |
P. Kay Metals | Trade Accounts Receivable |  |  |  |  |
Concentration risk |  |  | 0.00% |  | 0.00%

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