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Stockholders' Equity | 9 Months Ended
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Sep. 30, 2020
Equity [Abstract] |
Stockholders' Equity | STOCKHOLDERS’ EQUITY ATM Sales Agreement In January 2018, the Company entered into a common stock sales agreement under which the Company may sell shares of its common stock from time to time in “at-the-market” equity offerings (as defined in Rule 415 promulgated under the Securities Act of 1933, as amended). The Company will pay a commission of up to 3% of the gross proceeds of any common stock sold under this agreement plus certain legal expenses. The common stock sales agreement was amended in August 2018 to refer to the Company’s shelf registration statement on Form S-3 (File No. 333-227019) that was filed to replace the Company’s shelf registration statement on Form S-3 (File No. 333-206396) that expired on August 28, 2018. During the three months ended September 30, 2020, the Company sold 1,952,512 shares under the common stock sales agreement for gross proceeds of approximately $2.4 million and incurred offering expenses of approximately $82,000. During the nine months ended September 30, 2020, the Company sold 7,916,092 shares under the common stock sales agreement for gross proceeds of approximately $10.8 million and incurred offering expenses of approximately $420,000. The Company did not sell any shares under this agreement during the three or nine months ended September 30, 2019. April 2019 Underwritten Public Offering In April 2019, the Company closed an underwritten public offering of 4,575,000 shares of its common stock at a public offering price of $1.10 per share. The Company granted the underwriters a 30-day over-allotment option to purchase up to an additional 686,250 shares which was exercised in full on April 12, 2019. Including the over-allotment shares, the Company issued a total of 5,261,250 shares in the underwritten public offering and received gross proceeds of approximately $5.8 million and net proceeds of approximately $5.2 million after deducting underwriting discounts and offering expenses. Equity Line On April 22, 2020, the Company entered into a purchase agreement, or the Purchase Agreement, and a registration rights agreement with Lincoln Park Capital Fund, LLC, or Lincoln Park. Under the terms and subject to the conditions of the Purchase Agreement, the Company has the right, but not the obligation, to sell to Lincoln Park, and Lincoln Park is obligated to purchase up to $15.0 million of the Company’s common stock. Such sales of common stock by the Company may occur from time to time, at the Company’s sole discretion, subject to certain limitations, until May 19, 2023. On April 22, 2020, in accordance with the Purchase Agreement, the Company issued 285,714 shares of its common stock, or the Commitment Shares, to Lincoln Park in consideration for its commitment to purchase shares under the Purchase Agreement. The Company filed a registration statement on Form S-1 (File No. 333-237954) to register the resale by Lincoln Park of up to 7.5 million shares of the Company's common stock issued or issuable to Lincoln Park under the Purchase Agreement, including the Commitment Shares, and such registration statement was declared effective by the SEC on May 12, 2020. The Company incurred legal, accounting, and other fees related to the Purchase Agreement of approximately $374,000. These costs are amortized and expensed as shares are sold under the Purchase Agreement and as of September 30, 2020 there was approximately $269,000 of unamortized costs. During the three months ended September 30, 2020, the Company sold, and Lincoln Park purchased, 3.0 million shares under the Purchase Agreement for gross proceeds of approximately $3.3 million and incurred offering expenses of approximately $83,000. During the nine months ended September 30, 2020, the Company sold, and Lincoln Park purchased, 3,882,160 shares under the Purchase Agreement for gross proceeds of approximately $4.2 million and incurred offering expenses of approximately $105,000. Under the Purchase Agreement, on any business day until May 19, 2023, the Company may direct Lincoln Park to purchase up to 200,000 shares of common stock, each, a Regular Purchase. The Company may increase the share amount it directs Lincoln Park to purchase under a Regular Purchase to up to 250,000 shares or up to 300,000 shares if the closing sale price of the Company's common stock is not below $1.50 or $3.00, respectively, on the business day on which the Company initiates the purchase, subject to adjustment for any reorganization, recapitalization, non-cash dividend, stock split or other similar transaction as provided in the Purchase Agreement. However, Lincoln Park’s maximum commitment in any single Regular Purchase may not exceed $1.0 million. The purchase price per share for each Regular Purchase will be the lower of (i) the lowest sale price of the Company's common stock on the business day on which the Company initiates the purchase and (ii) the average of the three lowest closing sale prices of the Company's common stock during the 10-business day period immediately preceding the business day on which the Company initiates the purchase. In addition to Regular Purchases, the Company may also direct Lincoln Park to purchase other amounts of common stock as accelerated purchases and as additional accelerated purchases, subject to limits specified in the Purchase Agreement, at a purchase price per share calculated as specified in the Purchase Agreement, but in no case lower than the minimum price per share the Company stipulates in its notice to Lincoln Park initiating these purchases. In addition, under applicable Nasdaq rules, the Company may not issue or sell to Lincoln Park under the Purchase Agreement more than 4,941,089 shares of its common stock, or the Exchange Cap, unless (i) the Company obtains stockholder approval to issue shares in excess of the Exchange Cap or (ii) the average price of all applicable sales of the Company's common stock to Lincoln Park under the Purchase Agreement equals or exceeds $1.0117 (which represents the closing sale price per share of the Company's common stock on the day before the Company entered into the Purchase Agreement, plus an incremental amount). In addition, the Company may not sell shares to Lincoln Park under the Purchase Agreement if such sale would result in Lincoln Park beneficially owning more than 9.99% of the Company's then outstanding shares of common stock. Common Stock Warrants In February 2018, the Company closed an underwritten public offering in connection with which the Company issued to the investors in that offering warrants that initially had an exercise price of $3.00 per share and are exercisable through February 2023. The warrants include a price-based anti-dilution provision, which provides that, subject to certain limited exceptions, the exercise price of the warrants will be reduced each time the Company issues or sells (or is deemed to issue or sell) securities for a net consideration per share less than the exercise price of those warrants in effect immediately prior to such issuance or sale. In addition, subject to certain exceptions, if the Company issues, sells or enters into any agreement to issue or sell securities at a price which varies or may vary with the market price of the shares of the Company’s common stock, the warrant holders have the right to substitute such variable price for the exercise price of the warrant then in effect. These warrants are exercisable only for cash, unless a registration statement covering the shares issued upon exercise of the warrants is not effective, in which case the warrants may be exercised on a cashless basis. A registration statement covering the shares issued upon exercise of the warrants is currently effective. The Company estimated the fair value of the warrants as of February 15, 2018 to be approximately $3.0 million which has been recorded in equity as of the grant date. The Company early adopted ASU 2017-11 as of January 1, 2018 and recorded the fair value of the warrants as equity. In April 2019 and July 2020, in accordance with the price-based anti-dilution provision discussed above, the exercise price of these warrants was automatically reduced to $0.98 per share and to $0.96 per share, respectively, and as a result of the triggering of the anti-dilution provision, $0.8 million and $6,863, respectively, was recorded to additional paid-in capital. During the three months ended September 30, 2020, warrants to purchase an aggregate of 126,000 shares of common stock were exercised for gross proceeds of approximately $121,000. During the nine months ended September 30, 2020, warrants to purchase an aggregate of 1,825,000 shares of common stock were exercised for gross proceeds of approximately $1.8 million. No warrants were exercised during the three or nine months ended September 30, 2019. As of September 30, 2020, the Company had the following warrants outstanding:
Shares Underlying Outstanding Warrants |  | Exercise Price |  | Expiration Date
2,906 |  | $ | 120.40 |  | 2021-12-01
3,737 |  | $ | 120.40 |  | 2021-12-06
6,500 |  | $ | 10.00 |  | 2026-04-04
1,895,500 |  | $ | 0.96 |  | 2023-02-15
1,908,643 |  |  |  |  |

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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(e)(1)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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