In January 2019, the Company entered into an at-the-market program (the “ATM Program”). Pursuant to the ATM Program, under a Form S-3 shelf registration statement that was declared effective by the SEC in December 2018, the Company may, at its option, offer and sell shares of its Common Stock from time to time for an aggregate offering price of up to $20.0 million. The Company will pay the sales agent a commission of up to 3.0% of the gross proceeds from any future sales of such shares.

During the three and nine months ended September 30, 2019, the Company sold 1,707,995 shares of its Common Stock at a weighted average price of $1.50 per share for gross proceeds of approximately $2.6 million. Share issue costs, including sales agent commissions, totaled $151,000 during the reporting period.

In April 2019, the Company sold 10,526,500 shares of common stock in an underwritten public offering at a price of $1.90 per share for gross proceeds of $20.0 million. Underwriter discounts and commissions and other share issue costs totaled approximately $1.7 million.

On the SWK Closing Date, the Company entered into a Securities Purchase Agreement (the “First Tranche Securities Purchase Agreement”) with EW Healthcare Partners, L.P. and EW Healthcare Partners-A, L.P. (collectively, the “First Tranche Investors”), pursuant to which the Company offered and sold to the First Tranche Investors an aggregate of 8,606,324 shares of Common Stock at a purchase price of $1.10 per share (the “First Tranche Purchase Price”) for aggregate gross proceeds of approximately $9.5 million (the “First Tranche Transaction”).

On the SWK Closing Date, the Company entered into a Second Securities Purchase Agreement (the “Second Tranche Securities Purchase Agreement” and together with the First Tranche Securities Purchase Agreement, the “Securities Purchase Agreements”) with the First Tranche Investors and certain other accredited investors (collectively, the “Second Tranche Investors”), pursuant to which the Company, subject to the approval of the Company’s stockholders, would offer and sell to the Second Tranche Investors an aggregate of approximately $25.5 million of Units, with each Unit consisting of (a) one share of Common Stock and (b) one warrant to purchase a share of Common Stock (the “Second Tranche Transaction” and together with the First Tranche Transaction, the “Equity Transactions”).

At a special meeting of stockholders held on June 22, 2018, the Company’s stockholders approved the Second Tranche Transaction, following which, on June 25, 2018, the Company sold to the Second Tranche Investors an aggregate of 20,184,224 Units at a purchase price of $1.265 per Unit for gross proceeds of approximately $25.5 million, not including any proceeds that would be received from an exercise of the warrants (each a “Second Tranche Warrant”, and collectively, the “Second Tranche Warrants”). In addition, the stockholders approved the adoption of an amendment to the Company’s Certificate of Incorporation, as amended, to increase the number of authorized shares of Common Stock from 120,000,000 shares to 150,000,000 shares.

The Company determined that the shares of Common Stock issued in the First Tranche Transaction and the future obligation to issue Units in the Second Tranche Transaction were freestanding instruments. The Common Stock issued in the First Tranche Transaction was recorded as equity on the Company’s balance sheet. The future obligation to issue Units in the Second Tranche Transaction was recorded as a liability on the Company’s balance sheet, subject to remeasurement at fair value at each reporting period until settled.

The Company determined that the First Tranche Transaction and the Second Tranche Transaction should be accounted for as a single transaction. Accordingly, the total consideration received on the SWK Closing Date of $9.5 million was first allocated to the future obligation to issue Units in the Second Tranche Transaction at fair value as of the SWK Closing Date, with the residual amount allocated to the Common Stock issued in the First Tranche Transaction. Further, issuance costs of $343,000 were allocated to each of the freestanding instruments on the basis of relative fair value. A net amount of approximately $4.6 million was allocated to each of the Common Stock issued in the First Tranche Transaction and the future obligation to issue Units in the Second Tranche Transaction, respectively, as of the SWK Closing Date. As of March 31, 2018, the fair value of the Second Tranche Transaction derivative liability was approximately $6.9 million and the Company recorded the $2.2 million change in fair value for the quarter ended March 31, 2018.

The future obligation to issue Units in the second tranche transaction was revalued immediately prior to the Second Tranche Transaction on June 25, 2018 and resulted in a change in fair value of approximately $22.2 million. Upon consummation of the Second Tranche Transaction, the resulting derivative liability balance of approximately $29.1 million was reclassified to equity.

The Company determined that the Second Tranche Warrants were considered puttable warrants that represented an obligation that was indexed to the repurchase of the Company’s shares and could require a transfer of assets that required classification as derivative liabilities. The initial valuation of the Second Tranche Warrants on June 25, 2018 of approximately $18.2 million was revalued at June 30, 2018 and then immediately prior to exercise and resulted in a change in fair value of $1.6 million and $18.9 million, respectively. The change in fair value immediately prior to exercise, in September 2018, was determined as the excess of the closing share price of the Company’s Common Stock on the respective dates on which exercise notices were submitted by each of the Second Tranche Investors over the $1.43 exercise price. Upon exercise of the Second Tranche Warrants, the resulting derivative liability balance of $38.7 million was reclassified to equity.

The following table provides a reconciliation of fixed price warrants to purchase shares of the Company’s Common Stock for the nine months ended September 30, 2019 and 2018:

	Nine Months Ended September 30,
	2019				2018
			Weighted				Weighted
			Average				Average
	Number of		Exercise		Number of		Exercise
	Warrants		Price		Warrants		Price
Balance at beginning of period		486,812	$	1.23		—	$	—
Issued		—		—		486,812		1.23
Balance and exercisable at end of period		486,812	$	1.23		486,812	$	1.23

In connection with the SWK Credit Agreement (see Note 9), the Company issued the SWK Warrant to purchase (i) 409,091 Initial Advance Warrant Shares on March 28, 2018 at an exercise price of $1.10 per share with a seven-year term and (ii) 77,721 Additional Advance Warrant Shares on June 26, 2018 at an exercise price of $1.93 per share with a seven-year term. At September 30, 2019, the weighted average remaining life of the warrants was approximately 5.54 years.

At June 30, 2018, a total of 20,184,224 Second Tranche Warrants were outstanding with a variable exercise price and, accordingly, were excluded from the above table. These warrants were exercised in full in late September 2018 for proceeds of approximately $28.9 million.