Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies (Tables)

Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2019
Accounting Policies [Abstract]  
Schedule of computation of potentially dilutive securities For all periods presented in this report, convertible notes, stock options, and warrants were not included in the computation of diluted net loss per share because such inclusion would have had an antidilutive effect.
  Year Ended December 31,
Excluded potentially dilutive securities (1):
Convertible note - principal —    702,247   
Options to purchase common stock 3,463,692    1,694,068   
Unvested restricted stock 259,792    96,623   
Financing warrants to purchase common stock 4,805,747    2,340,828   
Total potential dilutive securities 8,529,231    4,833,766   

(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.
Customers representing at least 10% of total revenue
Accounts Receivable (Trade)
Revenue As of December 31,
Clarios (successor of Johnson Controls Battery Group, Inc.) 69  % 88  % 100  % 95  %
P. Kay Metals 28  % —  % —  % —  %