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Summary of Significant Accounting Policies - Schedule of Concentration of Credit Risk (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Clarios (successor of Johnson Controls Battery Group, Inc.) | Revenue |  |  |  |  |
Concentration risk | 80.00% | 95.00% | 71.00% | 86.00% |
Clarios (successor of Johnson Controls Battery Group, Inc.) | Accounts Receivable |  |  |  |  |
Concentration risk |  |  | 76.00% |  | 95.00%
Ocean Partners USA, Inc. | Revenue |  |  |  |  |
Concentration risk | 0.00% | 0.00% | 0.00% | 10.00% |
Ocean Partners USA, Inc. | Accounts Receivable |  |  |  |  |
Concentration risk |  |  | 0.00% |  | 0.00%
P. Kay Metals | Revenue |  |  |  |  |
Concentration risk | 17.00% | 0.00% | 26.00% | 0.00% |
P. Kay Metals | Accounts Receivable |  |  |  |  |
Concentration risk |  |  | 24.00% |  | 0.00%

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