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Stockholders' Equity
9 Months Ended
Sep. 30, 2020
Equity [Abstract]  
Preferred stock and convertible preferred stock
Preferred stock and convertible preferred stock consist of the following: 
 
September 30, 2020
 
December 31, 2019
Preferred stock, $0.001 par value; 5,000,000 shares authorized at September 30, 2020 and December 31, 2019; no shares issued and outstanding at September 30, 2020 and December 31, 2019
$

 
$

Series B convertible preferred stock, $0.001 par value; 147,000 shares designated at September 30, 2020 and December 31, 2019; 200 shares issued and outstanding at September 30, 2020 and December 31, 2019
$
1

 
$
1

Series D convertible preferred stock, $0.001 par value; 21,300 shares designated at September 30, 2020 and December 31, 2019; no shares issued and outstanding at September 30, 2020 and December 31, 2019
$

 
$

Series E convertible preferred stock, $0.001 par value; 7,000 shares designated at September 30, 2020 and December 31, 2019; no shares issued and outstanding at September 30, 2020 and December 31, 2019
$

 
$

Series F convertible preferred stock, $0.001 par value; 10,621 shares designated at September 30, 2020 and December 31, 2019; no shares issued and outstanding at September 30, 2020 and December 31, 2019
$

 
$

Stockholders' Equity
Stockholders’ Equity
 
Preferred stock and convertible preferred stock consist of the following: 
 
September 30, 2020
 
December 31, 2019
Preferred stock, $0.001 par value; 5,000,000 shares authorized at September 30, 2020 and December 31, 2019; no shares issued and outstanding at September 30, 2020 and December 31, 2019
$

 
$

Series B convertible preferred stock, $0.001 par value; 147,000 shares designated at September 30, 2020 and December 31, 2019; 200 shares issued and outstanding at September 30, 2020 and December 31, 2019
$
1

 
$
1

Series D convertible preferred stock, $0.001 par value; 21,300 shares designated at September 30, 2020 and December 31, 2019; no shares issued and outstanding at September 30, 2020 and December 31, 2019
$

 
$

Series E convertible preferred stock, $0.001 par value; 7,000 shares designated at September 30, 2020 and December 31, 2019; no shares issued and outstanding at September 30, 2020 and December 31, 2019
$

 
$

Series F convertible preferred stock, $0.001 par value; 10,621 shares designated at September 30, 2020 and December 31, 2019; no shares issued and outstanding at September 30, 2020 and December 31, 2019
$

 
$


 
2020 equity activity

In February 2020, the Company entered into an At Market Issuance Sales Agreement (the "Agreement") with respect to an at-the-market offering program ("ATM program"), under which the Company may offer and sell, from time to time at its sole discretion, shares of its common stock, par value $0.0001 per share (the "Common Stock"), having an aggregate offering price of up to $4,482,000 (the "Placement Shares"). The issuance and sale of the Placement Shares by the Company under the Agreement will be made pursuant to the Company's effective "shelf" registration statement on Form S-3. During the nine months ended September 30, 2020, 2,348,619 shares of common stock were issued pursuant to the Agreement for net proceeds of $4,143,431.

In March 2020, the Company issued 31,000 shares of fully vested common stock with a value of $43,751 pursuant to a Separation Agreement between the Company and an employee. The shares issued reflected the $1.41 closing price of the Company's common stock as reported on the Nasdaq Capital Market on March 11, 2020.

In June 2020, the Company issued 4,364 shares of fully vested common stock with a value of $7,606 pursuant to the Company's 2010 Employee Stock Purchase Plan.

2019 equity activity

During the nine months ended September 30, 2019, 2,998.2 shares of the Company's Series D Preferred Stock were converted into a total of 114,000 shares of Common Stock and 3,260.70 shares of the Company's Series E Preferred Stock were converted into a total of 123,981 shares of Common Stock.
On November 18, 2019, the Company effected a 1-for-10 reverse stock split of its Common Stock, or the Reverse Stock Split. The par value and other terms of the common stock were not affected by the Reverse Stock Split. Share, per share, and stock option amounts for all periods presented within the financial statements contained in the Quarterly Report on Form 10-Q, including the December 31, 2019 Balance Sheet amounts for Common Stock and additional paid-in capital, have been retroactively adjusted to reflect the Reverse Stock Split.