Redeemable Convertible Preferred Stock	6 Months Ended
Jun. 30, 2020
Redeemable Convertible Preferred Stock
Redeemable Convertible Preferred Stock	11. Redeemable Convertible Preferred Stock Series E Preferred Stock In November 2018, the Company issued an aggregate of 35,000 shares of the Company’s Series E Preferred Stock in a private placement to certain accredited investors in reliance on Section 4(a)(2) of the Securities Act. The Company received net proceeds of approximately $30.9 million, after deducting placement agent fees and expenses payable by the Company. The Company is required to redeem the Series E Preferred Stock in thirteen monthly installments in the amount of $2.7 million each from May 2019 through May 2020. The Company had zero and 500 shares of Series E Preferred Stock outstanding at June 30, 2020 and 2019, respectively. The remaining 500 shares were converted to common stock in January 2020. Series C Preferred Stock In April 2020, 870 shares of Series C Preferred Stock were converted to 923,819 shares of common stock. In May 2020, remaining the 1,750 shares of Series C Preferred Stock were converted into 1,858,256 shares of common stock.

Redeemable Convertible Preferred Stock

6 Months Ended

Jun. 30, 2020

Redeemable Convertible Preferred Stock

11. Redeemable Convertible Preferred Stock

Series E Preferred Stock

In November 2018, the Company issued an aggregate of 35,000 shares of the Company’s Series E Preferred Stock in a private placement to certain accredited investors in reliance on Section 4(a)(2) of the Securities Act. The Company received net proceeds of approximately $30.9 million, after deducting placement agent fees and expenses payable by the Company. The Company is required to redeem the Series E Preferred Stock in thirteen monthly installments in the amount of $2.7 million each from May 2019 through May 2020. The Company had zero and 500 shares of Series E Preferred Stock outstanding at June 30, 2020 and 2019, respectively. The remaining 500 shares were converted to common stock in January 2020.

Series C Preferred Stock

In April 2020, 870 shares of Series C Preferred Stock were converted to 923,819 shares of common stock. In May 2020, remaining the 1,750 shares of Series C Preferred Stock were converted into 1,858,256 shares of common stock.