Redeemable Preferred Stock	12 Months Ended
Dec. 31, 2019
Redeemable Preferred Stock.
Redeemable Preferred Stock	9. Redeemable Preferred Stock (in thousands, except share and per share data) Upon close of the Merger on December 30, 2019, 8,264,613 shares of Private NeuroBo Series A and Series B redeemable preferred stock (as adjusted for the Exchange Ratio) were converted to Private NeuroBo common stock on a 1:1 basis. Previously in April 2018, Private NeuroBo sold and issued in a private placement 4,801,020 shares of Series A redeemable convertible preferred stock (as adjusted for the Exchange Ratio) at $3.50 per share, raising $16,800 in gross proceeds. Subsequently in May and June 2019, Private NeuroBo sold and issued 3,463,593 Series B redeemable convertible preferred stock (as adjusted for the Exchange Ratio) at $7.00 per share, raising $24,240 in gross proceeds. As of December 31, 2018, the redeemable preferred stock was classified outside of stockholders' equity (deficit) because the shares contained certain redemption features that were not solely within the control of the Company. Private NeuroBo did not adjust the carrying values of the convertible preferred stock to the liquidation preferences of such shares because the occurrence of any such change of control event was not deemed probable.

9. Redeemable Preferred Stock (in thousands, except share and per share data)

Upon close of the Merger on December 30, 2019, 8,264,613 shares of Private NeuroBo Series A and Series B redeemable preferred stock (as adjusted for the Exchange Ratio) were converted to Private NeuroBo common stock on a 1:1 basis. Previously in April 2018, Private NeuroBo sold and issued in a private placement 4,801,020 shares of Series A redeemable convertible preferred stock (as adjusted for the Exchange Ratio) at $3.50 per share, raising $16,800 in gross proceeds. Subsequently in May and June 2019, Private NeuroBo sold and issued 3,463,593 Series B redeemable convertible preferred stock (as adjusted for the Exchange Ratio) at $7.00 per share, raising $24,240 in gross proceeds.

As of December 31, 2018, the redeemable preferred stock was classified outside of stockholders' equity (deficit) because the shares contained certain redemption features that were not solely within the control of the Company. Private NeuroBo did not adjust the carrying values of the convertible preferred stock to the liquidation preferences of such shares because the occurrence of any such change of control event was not deemed probable.