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Summary of Significant Accounting Policies (Tables)

6 Months Ended

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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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.

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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.

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