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Summary of Significant Accounting Policies (Policies) | 9 Months Ended
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Sep. 30, 2019
Accounting Policies [Abstract] |
Basis of Presentation | Basis of presentation The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) as found in the Accounting Standards Codification (“ASC”) and ASU of the Financial Accounting Standards Board (“FASB”) and pursuant to the rules and regulations of the SEC. Accordingly, they do not include all the information and footnotes required by such accounting principles for complete financial statements. In the opinion of management, all adjustments (which include normal recurring adjustments) considered necessary to present fairly each of the condensed consolidated balance sheets as of September 30, 2019, the condensed consolidated statements of operations for the three and nine months ended September 30, 2019 and September 30, 2018, the condensed consolidated statements of stockholders' equity for the three and nine months ended September 30, 2019 and September 30, 2018 and the condensed consolidated statements of cash flows for the nine months ended September 30, 2019 and September 30, 2018, as applicable, have been made. The condensed consolidated balance sheet as of December 31, 2018 has been derived from the Company’s audited financial statements as of such date, but it does not include all disclosures required by U.S. GAAP. The accompanying unaudited condensed consolidated financial statements should be read in conjunction with our audited consolidated financial statements for the period ended December 31, 2018, which are included on Form 10-K filed with the Securities and Exchange Commission on February 28, 2019. The results of operations for the three and nine months ended September 30, 2019 are not necessarily indicative of results that may be expected for the year ended December 31, 2019
Principles of consolidation | Principles of consolidation The accompanying unaudited condensed consolidated financial statements include the accounts of the Company and its Subsidiaries, both of which are wholly-owned subsidiaries. Significant inter-company accounts and transactions have been eliminated in consolidation.
Use of estimates | Use of estimates The preparation of the condensed consolidated financial statements requires management of the Company to make a number of estimates and assumptions relating to the reported amount of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements, and the reported amounts of expenses during the period. Significant items subject to such estimates and assumptions include the carrying amount and valuation of long-lived assets, the valuation of conversion features of convertible debt, valuation allowances for deferred tax assets, the determination of fair value of estimated asset retirement obligations, the determination of stock option expense and the determination of the fair value of stock warrants issued. Actual results could differ from those estimates.
Net loss per share | Net loss per share Basic net loss per share is computed by dividing net loss by the weighted average number of common shares outstanding during the period. Diluted net loss per share is computed by dividing the net loss by the weighted-average number of common share equivalents outstanding for the period determined using the treasury-stock method or the if-converted method, as applicable. For purposes of this calculation, stock options, restricted stock units (RSUs) and warrants to purchase common stock are considered to be common stock equivalents and are only included in the calculation of diluted net loss per share when their effect is dilutive.
Segment and geographic information | Segment and geographic information Operating segments are defined as components of an enterprise engaging in business activities for which discrete financial information is available and regularly reviewed by the chief operating decision maker in deciding how to allocate resources and in assessing performance. The chief operating decision maker views its operations and manages its business in one operating segment, and the Company operates in only one geographic segment.
Concentration of credit risk | 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 | % |  | — | %
Recent accounting pronouncements | Recently adopted accounting guidance In February 2016, the FASB issued ASU 2016-02 - Leases (ASC 842), which sets out the principles for the recognition, measurement, presentation and disclosure of leases for both parties to a contract (i.e. lessees and lessors). The new standard requires lessees to apply a dual approach, classifying leases as either finance or operating leases based on the principle of whether or not the lease is effectively a financed purchase by the lessee. This classification will determine whether lease expense is recognized based on an effective interest method or on a straight-line basis over the term of the lease, respectively. A lessee is also required to record a right-of-use asset and a lease liability for all leases with a term of greater than 12 months regardless of their classification. Leases with a term of 12 months or less will be accounted for similar to existing guidance for operating leases today. ASC 842 supersedes the previous leases standard, ASC 840 Leases. The standard has been adopted as of January 1, 2019. The new standard requires a modified retrospective transition approach for all leases existing at, or entered into after, the date of initial application, with an option to use certain transition relief. In July 2018, the FASB issued ASU No. 2018-11, Leases (Topic 842): Targeted Improvements, which amends ASC Topic 842 to provide another transition method, allowing a cumulative effect adjustment to the opening balance of retained earnings during the period of adoption. The Company has two longer term office leases and one equipment finance lease. The adoption of ASU 2016-02 on January 1, 2019 resulted in the recognition of right-of-use assets of approximately $1.6 million, lease liabilities for operating leases of approximately $1.8 million and no material impact to the Consolidated Balance Sheets and Consolidated Statements of Operations. See Note 9 for further information regarding the impact of the adoption of ASU 2016-02 on the Company's financial statements. Recent accounting pronouncements There were no other recent accounting pronouncements or changes in accounting pronouncements during the nine months ended September 30, 2019 that are of significance or potential significance to the Company.

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- Definition Disclosure of accounting policy regarding (1) the principles it follows in consolidating or combining the separate financial statements, including the principles followed in determining the inclusion or exclusion of subsidiaries or other entities in the consolidated or combined financial statements and (2) its treatment of interests (for example, common stock, a partnership interest or other means of exerting influence) in other entities, for example consolidation or use of the equity or cost methods of accounting. The accounting policy may also address the accounting treatment for intercompany accounts and transactions, noncontrolling interest, and the income statement treatment in consolidation for issuances of stock by a subsidiary. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.3A-02) -URI http://asc.fasb.org/extlink&oid=27015204&loc=d3e355033-122828 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.3A-03) -URI http://asc.fasb.org/extlink&oid=27015204&loc=d3e355100-122828 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109239629&loc=d3e5614-111684 + Details
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