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Convertible Preferred Stock
12 Months Ended
Dec. 31, 2022
Equity [Abstract]  
Convertible Preferred Stock Convertible Preferred StockIn March 2018, the Company issued 3,000,581 shares of Series A convertible preferred stock to an existing investor through the March 2018 Direct Registered Offering at a price of $8.31 per share. At the date of the financing, because the effective conversion rate of the preferred stock was less than the market value of the Company’s common stock, a beneficial conversion feature of $2.7 million was recorded as a discount to the convertible preferred stock and an increase to additional paid in capital. Because the preferred stock was perpetual and convertible at the option of the holder at any time, the Company fully amortized the discount related to the beneficial conversion feature as a deemed dividend which was recognized as an increase to accumulated deficit and net loss attributable to common stockholders. Effective on April 19, 2018, all outstanding shares of Series A convertible preferred stock were converted into shares of common stock at a conversion ratio of 1 1. Further, in May 2018, the Company filed a Certificate of Elimination of the Series A Convertible Preferred Stock de-authorizing the 3,000,581 shares of Series A convertible preferred stock. The Company had no outstanding preferred stock as of December 31, 2022 and 2021.