Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Schedule of Concentration of Credit Risk (Details)

v3.19.1
Summary of Significant Accounting Policies - Schedule of Concentration of Credit Risk (Details)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Johnson Controls Battery Group, Inc. | Revenue    
Concentration risk, percentage 60.00% 79.00%
Johnson Controls Battery Group, Inc. | Accounts Receivable    
Concentration risk, percentage 60.00% 95.00%
Ocean Partners USA, Inc. | Revenue    
Concentration risk, percentage 0.00% 18.00%
Ocean Partners USA, Inc. | Accounts Receivable    
Concentration risk, percentage 0.00% 0.00%
P. Kay Metals | Revenue    
Concentration risk, percentage 37.00% 0.00%
P. Kay Metals | Accounts Receivable    
Concentration risk, percentage 37.00% 0.00%