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Summary of Significant Accounting Policies (Tables) | 6 Months Ended
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Jun. 30, 2020
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 six months ended June 30, as indicated below.
| June 30, |  |
Excluded potentially dilutive securities (1): | 2020 |  | 2019
Options to purchase common stock | 1,425,004 |  |  | 3,604,001 |
Unvested restricted stock units | 4,244,003 |  |  | 242,023 |
Financing warrants to purchase common stock | 103,500 |  |  | 4,839,197 |
Total potential dilutive securities | 5,772,507 |  |  | 8,685,221 |
(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 six months ended June 30, 2020 and June 30, 2019, respectively. They also represented a significant portion of our trade accounts receivable as of December 31, 2019. The Company did not have a trade accounts receivable balance as of June 30, 2020.
| Revenue |  |  |  | Revenue |  |  |  | Trade Accounts Receivable |  |
| Three Months Ended June 30, |  |  |  | Six Months Ended June 30, |  |  |  | June 30, 2020 |  | December 31, 2019
| 2020 |  | 2019 |  | 2020 |  | 2019 |  |  |  |
Clarios (successor of Johnson Controls Battery Group, Inc.) | — | % |  | 59 | % |  | 100 | % |  | 59 | % |  | — | % |  | 100 | %
P. Kay Metals | — | % |  | 38 | % |  | — | % |  | 38 | % |  | — | % |  | — | %

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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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- Definition Tabular disclosure of the nature of a concentration, a benchmark to which it is compared, and the percentage that the risk is to the benchmark. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13537-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13531-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6327-108592 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6442-108592 + Details
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