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Subsequent Events | 12 Months Ended
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Dec. 31, 2018
Subsequent Events [Abstract] |
Subsequent Events | NOTE 14 – Subsequent Events In January 2019, Sigma issued each of its four non-employee directors 50,000 shares of common stock, under the 2013 Equity Incentive Plan, with such shares to vest ratably over four quarterly installments, subject in each case to such director’s continuing service as a director. In January 2019, the Company granted to twelve employees options under the 2013 Equity Incentive Plan options to purchase an aggregate of up to 99,376 shares of common stock, with each option having an exercise price equal to $1.50 per share, which was the closing market price of the company’s stock on December 31, 2018, (i.e., the trading day immediately preceding the date of grant) and vesting ratably over four years on each anniversary date of the grant subject in each case to the employee’s continuing employment with the Company. In January 2019, the Company granted to our Vice-President of Business Development a fully vested option to purchase up to 11,832 shares of common with an exercise price of $2.02, which was the closing price of the Company’s stock on the date of grant, in exchange for the cancellation of his accrued and unpaid vacation balance as of December 31, 2018. Also in January 2019, the Company issued 90,831 shares of common stock upon the cashless exercise of Unit Purchase Options issued in our June 2018 public offering. In January and February 2019, the Company issued a total of 67,830 shares of common stock upon the exercise of 67,830 warrants having an exercise price of $1.08 resulting in gross cash proceeds of $73,256. In the first quarter of 2019, the Company granted our CEO and President three options (the “Options”) to purchase up to 22,916 shares of our common stock under our 2013 Equity Incentive Plan in connection with his employment arrangement. The Options have an exercise price per share equal to $1.50, $1.9262, and $2.04, respectively, and each is fully vested. On March 9, 2019, the Company issued to our Vice President of Business Development 1,500 shares of common stock, which vested immediately, in connection with the satisfaction of a performance milestone. On March 15, 2019, the Company closed a public offering of equity securities in which it issued 1,400,800 shares of common stock and warrants to purchase a total of 420,240 shares of common stock resulting in net proceeds of approximately $1,679,230, after deducting placement agent commissions and other offering expenses payable by the Company. During the first quarter of 2019, the Company received notice of the issuance of two new patents: Patent No. 10207489 “Systems and Methods for Additive Manufacturing Operations” and Patent No. 10226817, Material Qualification System and Methodology”.

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- Definition The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 855 -URI http://asc.fasb.org/topic&trid=2122774 + Details
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