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Stockholders' Equity
 12 Months Ended
Dec. 31, 2021
Equity [Abstract]  
Stockholders' Equity Stockholders’ Equity
Common Stock
On August 6, 2018, the Company completed a private placement of 12,062,000 shares of its common stock and warrants (the “2018 Warrants”) to purchase an additional 4,221,700 shares of its common stock, subject to adjustment for stock splits, reverse stock splits, stock dividends and similar transactions, to certain accredited investors for gross proceeds of $19.7 million in cash. Each warrant had an initial exercise price of $2.52 per share, subject to adjustment for stock splits, reverse stock splits, stock dividends and similar transactions.
On March 28, 2019, the 2018 Warrants were exercised at an exercise price of $2.52 per share, for aggregate cash proceeds to the Company of approximately $10.6 million. In connection with the exercise of the 2018 Warrants, on March 28, 2019, the Company issued additional warrants to purchase 2,500,000 shares of common stock (the “2019 Warrants”) to the accredited investors. Each 2019 Warrant has an initial exercise price of $7.00 per share, subject to adjustment for stock splits, reverse stock splits, stock dividends and similar transactions, will be exercisable at any time on or after September 28, 2019, and will expire on June 30, 2022. The 2019 Warrants may be exercisable on a cashless exercise basis if, and only if, the shares of common stock underlying such warrants cannot be immediately resold pursuant to an effective registration statement or Rule 144 of the Securities Act of 1933, as amended, without volume or manner of sale restrictions.
During the fourth quarter of 2019, the Company received $6.9 million in net cash proceeds from the exercise of 1,255,129 of the Company’s common stock purchase warrants issued in 2015.
The Company assessed the terms of the warrants under ASC 815, Derivatives and Hedging. Pursuant to this guidance, the Company has determined that the warrants do not require liability accounting and has classified the warrants as equity.
On January 25, 2021, the Company entered into an Equity Distribution Agreement with Canaccord Genuity LLC (the “Agent”), pursuant to which the Company may offer and sell, from time to time, through or to the Agent, up to $40.0 million of shares of its common stock (the “ATM Offering”). In January 2021, the Company sold 1,516,073 shares of common stock, at an average price of $20.11 per share, for net proceeds of $29.4 million, after deducting underwriter fees and discounts of $0.9 million, and other offering fees, pursuant to the ATM Offering.
Preferred Stock
The Company has a total of 2,000,000 shares of preferred stock authorized for issuance at a par value of $0.001 per share, 150,000 of which have been designated Series D Preferred Stock and 39,500 of which have been designated Series E Preferred Stock.
On August 9, 2019, the Company completed a private placement of 10,000 shares of Series E Preferred Stock for an aggregate purchase price of $10.0 million in accordance with the terms and provisions of a Securities Purchase Agreement, dated August 9, 2019, by and among the Company and certain accredited investors. Each share of Series E Preferred Stock entitles the holder thereof to receive, when, as and if declared by the Company out of assets legally available therefor, cumulative cash dividends at an annual rate of 9.00% payable quarterly in arrears on January 1, April 1, July 1 and October 1 of each year, beginning on October 1, 2019. If dividends are not declared and paid in any quarter, or if such dividends are declared but holders of the Series E Preferred Stock elect not to receive them in cash, the quarterly dividend will be deemed to accrue and will be added to the Series E Base Amount. The Series E Preferred Stock has no voting rights unless otherwise required by law. The Series E Preferred Stock is perpetual and has no maturity date. However, the Company may, at its option, redeem shares of the Series E Preferred Stock, in whole or in part, on or after July 1, 2022, at a price equal to 110% of the Series E Base Amount plus (without duplication) any accrued and unpaid dividends. The “Series E Base Amount” means $1,000 per share, plus any accrued but unpaid dividends, whether or not declared by the Company’s board of directors, subject to appropriate adjustment in the event of any stock dividend, stock split, combination or other similar recapitalization with respect to the Series E Preferred Stock. In the event of a liquidation, dissolution or winding up of the Company, the holders of the Series E Preferred Stock will be entitled to receive, after satisfaction of liabilities to creditors and subject to the rights of holders of any senior securities, but before any distribution of assets is made to holders of common stock or any other junior securities, the Series E Base Amount plus (without duplication) any accrued and unpaid dividends.
On March 6, 2020, the Company entered into a Securities Purchase Agreement with an accredited investor pursuant to which, among other things, the Company issued and sold to the investor, in a private placement transaction, an aggregate of 25,000 shares of the Company’s Series E Preferred Stock, for a purchase price of $1,000 per share of Series E Preferred Stock, resulting in gross proceeds to the Company of $25.0 million.

On September 3, 2021, the Company entered into separate privately-negotiated exchange agreements (the “September Exchange Agreements”) with Golden Harbor Ltd. and North Sound Trading, L.P. (the “Participating Stockholders”), holders of the Company’s outstanding Series E Preferred Stock. Pursuant to each respective September Exchange Agreement, each of the Participating Stockholders agreed to exchange Series E Preferred Stock that they held (representing an aggregate of 10,000 shares of Series E Preferred Stock) for an aggregate of 1,525,207 shares of common stock, of the Company (the “Series E Exchange Transactions”). The Company did not receive any cash proceeds from the Participating Stockholders in connection with the Series E Exchange Transactions.

The Company used the Guidance in ASC 470 Debt, regarding the modification of debt instruments and determined that the Series E Exchange Transactions were an extinguishment. If a modification or exchange represents an extinguishment for accounting purposes, it is accounted for as a redemption of the existing equity instrument and the issuance of a new instrument.
ASC 260-10-S99-2 (“SEC Staff Announcement: The Effect on the Calculation of Earnings Per Share for a Period That Includes the Redemption or Induced Conversion of Preferred Stock”) provides guidance on the accounting for extinguishments (redemptions) of equity-classified preferred stock. Under that guidance, an SEC registrant compares (1) the fair value of the consideration transferred to the holders of the preferred stock and (2) the carrying amount of the preferred stock immediately before the modification or exchange (net of issuance costs). The difference is treated as a return to (or from) the holder of the
preferred stock in a manner similar to dividends paid on preferred stock. Any excess of fair value of the consideration transferred to the holders of the preferred stock over the carrying amount of the preferred stock in the issuer’s balance sheet is treated as a dividend to those holders and charged against retained earnings.
The Company determined that the Series E Exchange Transactions resulted in an extinguishment of preferred stock and an issuance of common stock. The difference between the carrying amount of the preferred stock plus accrued dividends, and the fair value of the common stock exchanged for such preferred stock, totaled $1.1 million. The difference was treated as a deemed dividend, and was included within the Series E preferred stock dividends and deemed dividends from the preferred stock exchange, in the consolidated results of operations for the year ended December 31, 2021.
There were no dividends declared and $3.1 million and $2.9 million of dividends were accrued as of December 31, 2021, and 2020, respectively.
Common Shares Reserved for Future Issuance
The Company had reserved shares of common stock for possible future issuance as of December 31, 2021 and 2020 as follows:
 December 31,
  20212020
Common stock warrants outstanding2,500,000 2,500,000 
Stock options outstanding 8,085,793 8,479,979 
Restricted stock units outstanding1,247,723 417,105 
Shares available for issuance pursuant to Convertible Notes14,340,786 15,879,948 
Shares available for future grants of awards under the 2018 Omnibus Incentive Compensation Plan3,311,023 2,849,488 
Shares available under the 2000 Employee Stock Purchase Plan170,811 391,201 
Total shares of common stock reserved for issuance29,656,136 30,517,721