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Common stock and convertible preferred stock | 6 Months Ended
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Jun. 30, 2021
Common stock and convertible preferred stock |
Common stock and convertible preferred stock | 7. Common stock and convertible preferred stock Common stock The holders of common stock are entitled to one vote for each share of common stock. Subject to the approval of the majority of shareholders, the holders of common stock shall be entitled to receive dividends out of funds legally available. In the event of any voluntary or involuntary liquidation, dissolution, or winding up of the Company, the holders of common stock shall be entitled to share ratably in the remaining assets of the Company available for distribution. ​ On April 28, 2021, the Company sold 1,000,000 units, each unit comprising one share of the Company’s common stock and one Series B Warrant (each, a Series B Warrant) to purchase one-half a share of common stock. The units were issued in a private placement at a price of $27.00 per unit for gross proceeds of $27.0 million. The Series B Warrants are equity-classified, exercisable at any time, have an exercise price of $45.00 per share and will terminate at three years from the date of issuance. The fair value of the warrants on the date of issuance was $6.0 million. The fair value of the warrants was estimated using a Black-Scholes Option Pricing Model. The significant assumptions used in preparing the option pricing model for valuing the Company's warrants to purchase shares of common stock as of April 28, 2021 included (i) volatility of 82.7%, (ii) risk free interest rate of 0.35%, (iii) strike price of $45.00 er share, (iv) fair value of common stock of $28.70 per share, and (v) expected life of three years. The Series B Warrants are callable by the Company in certain circumstances. ​ On October 6, 2020, the Company closed the IPO in which the Company issued and sold 3,737,500 shares of its common stock at a public offering price of $12.00 per share, including 487,500 shares of the Company’s common stock sold pursuant to the underwriters’ option to purchase additional shares. The Company received net proceeds of $41.7 million after deducting underwriting discounts and commissions of $3.1 million but before deducting other offering expenses. The Company’s common stock is listed on the Nasdaq Capital Market under the trading symbol “IMNM.” On October 6, 2020, the Company filed an amended and restated certificate of incorporation to, among other things, increase the number of shares of common stock, $0.0001 par value per share, authorized for issuance to 200,000,000 and authorize the Company’s board of directors to issue up to 10,000,000 shares of “blank check” preferred stock, $0.0001 par value per share. Series A convertible preferred stock Prior to the IPO, all of the Company’s convertible preferred stock was classified outside of stockholders’ deficit because the shares contained certain redemption features that were not solely within the control of the Company. At the time of issuance, the redeemable convertible preferred stock was recorded at its issuance price, less issuance costs. During the year ended December 31, 2019, the Company sold 512,826 shares of its Series A Preferred at $9.00 per share in exchange for $4.6 million in gross proceeds and incurred $35,000 of related issuance costs and issued 821,657 shares of Series A Preferred in connection with the conversion of the promissory notes of $6.8 million. In 2020, the Company completed the sale of an additional 1,226,925 shares of Series A Preferred at $9.00 per share, resulting in gross cash proceeds of $11.0 million, which includes 4,722 shares issued in January 2020 for gross receipts of $45,000. During the six months ended June 30, 2020, the Company sold 1,226,925 shares of Series A Preferred for net proceeds of $9.5 million and issued 1,035,196 warrants to purchase shares of the Company’s Series A Preferred with a fair value of $1.5 million. The warrants were exercisable at any time and had an exercise price of $9.00 per share and were to terminate at the earlier of (i) three years from the date of issuance, (ii) upon liquidation of the Company and (iii) upon the Company’s securities trading at $27.00 per unit for at least 10 days out of a consecutive 20-day trading period beginning after the first anniversary of the IPO. The warrants were originally liability-classified as the underlying Series A convertible preferred stock was contingently redeemable and outside of the Company’s control. Upon completion of the IPO on October 6, 2020, the warrants became exercisable for shares of the Company’s common stock and the $7.1 million warrant liability was reclassified to additional paid-in capital. In connection with the Company’s sale of its Series A Preferred in 2015, a future milestone closing provision (the Future Milestone) was included requiring the Company to sell, on the same terms and conditions as the initial offering, an aggregate of $3.5 million of additional Series A Preferred upon achievement of certain development and strategic milestones, as defined in the purchase agreement and at $9.00 per share, or 388,888 shares of Series A Preferred. The Future Milestone did not occur and the Company’s obligations under this right terminated upon completion of the Company’s IPO. The Company determined that the future tranche right related to the Future Milestone did not meet the definition of a freestanding financial instrument as it was not legally detachable. The future tranche right was also evaluated as an embedded derivative and the Company determined it did not meet the definition of a derivative instrument for which bifurcation would be required. In connection with the IPO, all of the Series A Preferred converted into 5,670,184 shares of common stock and all of the outstanding warrants to purchase convertible preferred stock converted into warrants to purchase common stock. Warrants to acquire shares of common stock At June 30, 2021 common stock warrants outstanding were as follows:
​ | ​ | ​ | ​ | ​
Warrants |  | Exercise Price per Share | ​ | Expiration Date
862,181 | ​ | $ 9.00 | ​ | June 2, 2023
500,000 | ​ | $ 45.00 | ​ | April 28, 2024
​ During the six months ended June 30, 2021, 100,695 warrants were exercised and the Company received proceeds of $0.9 million and 100,695 shares of the Company’s common stock were issued. Additionally, 72,320 warrants were cashless exercised during the six months ended June 30, 2021 and 45,322 shares of the Company’s common stock were issued.

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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(e)(1)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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