The accompanying unaudited condensed consolidated financial statements and notes follow the same significant accounting policies as those described in the notes to the audited consolidated financial statements of the Company for the year ended December 31, 2020, except as described below.

The Company has entered into arrangements involving the sale or license of intellectual property and the provision of other services. When entering into any arrangement involving the sale or license of intellectual property rights and other services, the Company determines whether the arrangement is subject to accounting guidance in ASC 606, Revenue from Contracts with Customers (“Topic 606”), as well as ASC 808, Collaborative Arrangements ("Topic 808"). If the Company determines that an arrangement includes goods or services that are central to the Company’s business operations for consideration, the Company will then identify the performance obligations in the contract using the unit-of-account guidance in Topic 606. For a distinct unit-of-account that is within the scope of Topic 606, the Company applies all of the accounting requirements in Topic 606 to that unit-of-account, including the recognition, measurement, presentation and disclosure requirements. For a distinct unit-of-account that is not within the scope of Topic 606, the Company will recognize and measure the distinct unit-of-account based on other authoritative ASC Topics or on a reasonable, rational, and consistently applied policy election.

Analyzing the arrangement to identify performance obligations requires the use of judgment. In arrangements that include the sale or license of intellectual property and other promised services, the Company first identifies if the licenses are distinct from the other promises in the arrangement. If the license is not distinct, the license is combined with other services into a single performance obligation. Factors that are considered in evaluating whether a license is distinct from other promised services include, for example, whether the counterparty can benefit from the license without the promised service on its own or with other readily available resources and whether the promised service is expected to significantly modify or customize the intellectual property.

The Company classifies non-refundable upfront payments, milestone payments and royalties received for the sale or license of intellectual property as revenues within its statements of operations because the Company views such activities as being central to its business operations. For the sale of intellectual property that is distinct, fixed consideration and variable consideration are included in the transaction price and recognized in revenue immediately to the extent that it is probable that there would not be a significant reversal of cumulative revenue in the future. For the license of intellectual property that is distinct, fixed and variable consideration (to the extent there will not be a significant reversal in the future) are also recognized immediately in income, except for consideration received in the form of royalty or sales-based milestones, which is recorded when the customer’s subsequent sales or usages occur. If the sale or license of intellectual property is not distinct, revenue is deferred and recognized over the estimated period of the Company’s combined performance obligation. For contractual arrangements that meet the definition of a collaborative arrangement under Topic 808, consideration received for any units-of-account that are outside the scope of Topic 606 are recognized in the statements of operations by considering (i) the nature of the arrangement, (ii) the nature of the Company’s business operations, and (iii) the contractual terms of the arrangement.

The Company calculates net loss per common share in accordance with ASC 260, Earnings Per Share. Basic net loss per common share for the three months ended March 31, 2021 and 2020 was determined by dividing net loss applicable to common stockholders by the weighted average number of common shares outstanding during the period. Per ASC 260, Earnings Per Share, the weighted average number of common shares outstanding utilized for determining the basic net loss per common share for the three months ended March 31, 2021 includes the pre-funded warrants to purchase 5,260,000 shares of common stock issued in the December 2020 Public Offering. Diluted net loss per common share for the three months ended March 31, 2021 and 2020 was determined as follows (in thousands, except share and per share amounts):

	Three Months Ended March 31,
	2021			2020
Net loss	$	(4,676	)	$	(7,002	)
Dilutive effect of warrant liability		(1,323	)		—
Net loss allocated to common shares	$	(5,999	)	$	(7,002	)

Weighted average common shares outstanding – basic		25,802,700			9,744,577
Dilutive effect of warrant liability		721,220			—
Weighted average common shares outstanding – diluted		26,523,920			9,744,577

Net loss per share – diluted	$	(0.23	)	$	(0.72	)

The following potentially dilutive shares of common stock have not been included in the computation of diluted net loss per share for the three months ended March 31, 2021 and 2020, as the result would be anti-dilutive:

	Three Months Ended March 31,
	2021		2020
Outstanding stock options		1,371,606		768,354
Outstanding restricted stock units		96,974		85,754
Warrants to purchase common stock associated with June 2016 public offering		421,867		421,867
Warrants to purchase common stock associated with March 2018 public offering – Series 2		798,810		798,810
Warrants to purchase common stock associated with December 2019 Public Offering		4,472,205		4,472,205
Warrants to purchase common stock associated with December 2020 Public Offering - Series 2		6,800,000		—
Common stock associated with March 2019 Notes		1,138,200		1,138,200
Warrants to purchase common stock associated with Solar loan agreement		12,243		12,243
Total		15,111,905		7,697,433

In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments (“ASU 2016-13”). The amendments in ASU 2016-13 require a financial asset (or a group of financial assets) measured at amortized cost basis to be presented at the net amount expected to be collected. In November 2019, the FASB issued ASU No. 2019-10, Financial Instruments – Credit Losses (Topic 326), Derivatives and Hedging (Topic 815), and Leases (Topic 842) (“ASU 2019-10”), which revised the effective dates for ASU 2016-13 for public business entities that meet the SEC definition of a smaller reporting company to fiscal years, and interim periods within those fiscal years, beginning after December 15, 2022, with early adoption permitted. As a smaller reporting company, the Company is currently evaluating the impact ASU 2016-13 will have on its consolidated financial statements.

In August 2020, the FASB issued ASU No. 2020-06, Debt—Debt with Conversion and Other Options and Derivatives and Hedging—Contracts in Entity’s Own Equity: Accounting for Convertible Instruments and Contracts in and Entity’s Own Equity (“ASU 2020-06”). The amendments in ASU 2020-06 reduce the number of accounting models for convertible debt instruments and revises certain guidance relating to the derivative scope exception and earnings per share. The amendments in ASU 2020-06 are effective for public business entities that meet the definition of a SEC filer and a smaller reporting company for fiscal years beginning after December 15, 2023, and interim periods within those years. As a smaller reporting company, the Company is currently evaluating the impact ASU 2020-06 will have on its consolidated financial statements.

In December 2019, the FASB issued ASU No. 2019-12, Income Taxes: Simplifying the Accounting for Income Taxes (“ASU 2019-12”). ASU 2019-12 simplifies the accounting for income taxes, eliminates certain exceptions within ASC 740, Income Taxes, and clarifies certain aspects of the current guidance to promote consistency among reporting entities. This guidance was adopted by the Company in the first quarter of 2021 and it did not have a material impact on its unaudited condensed consolidated financial statements.