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Summary of Significant Accounting Policies (Tables) | 9 Months Ended
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Sep. 30, 2019
Accounting Policies [Abstract] |
Schedule of computation of potentially dilutive securities | The following shares underlying outstanding convertible notes, stock options, RSUs and warrants to purchase common stock were antidilutive due to a net loss in the periods presented and, therefore, were excluded from the dilutive securities computation for the nine months ended September 30, as indicated below.
| September 30,
Excluded potentially dilutive securities (1): | 2019 |  | 2018
Convertible note - principal | — |  |  | 702,247 |
Options to purchase common stock | 3,623,138 |  |  | 1,632,483 |
Unvested restricted stock units | 403,154 |  |  | 107,723 |
Financing warrants to purchase common stock | 4,839,197 |  |  | 2,340,828 |
Total potential dilutive securities | 8,865,489 |  |  | 4,783,281 |
(1) | The number of shares is based on the maximum number of shares issuable on exercise or conversion of the related securities as of the period end. Such amounts have not been adjusted for the treasury stock method or weighted average outstanding calculations as required if the securities were dilutive.
Schedule of concentration of credit risk | Revenues from the following customers each represented at least 10% of total revenue for the three and nine months ended September 30, 2019 and 2018, respectively. They also represented a significant portion of our accounts receivable as of September 30, 2019 and December 31, 2018, respectively.
| Revenue |  | Revenue |  | Accounts Receivable
| Three months ended September 30, |  | Nine months ended September 30, |  | September 30, 2019 |  | December 31, 2018
| 2019 |  | 2018 |  | 2019 |  | 2018 |  |
Clarios (successor of Johnson Controls Battery Group, Inc.) | 80 | % |  | 95 | % |  | 71 | % |  | 86 | % |  | 76 | % |  | 95 | %
Ocean Partners USA, Inc. | — | % |  | — | % |  | — | % |  | 10 | % |  | — | % |  | — | %
P. Kay Metals | 17 | % |  | — | % |  | 26 | % |  | — | % |  | 24 | % |  | — | %

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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