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Significant Accounting Policies (Policies)
3 Months Ended
Mar. 31, 2021
Accounting Policies [Abstract]  
Basis of Accounting, Policy [Policy Text Block]
Basis of Presentation
 
The accompanying unaudited interim consolidated financial statements of the Company have been prepared in accordance with GAAP for interim financial information as found in the ASC and ASUs of the FASB, and with the instructions to Form
10
-Q and Article
10
of Regulation S-
X
promulgated by the SEC. In the opinion of management, the accompanying unaudited interim consolidated financial statements of the Company include all normal and recurring adjustments (which consist primarily of accruals, estimates and assumptions that impact the unaudited interim consolidated financial statements) considered necessary to present fairly the Company's financial position as of 
March 
31,
2021,
and its results of operations and cash flows for the
three
months ended
March 
31,
2021
and
2020.
Operating results for the
three
months ended 
March 
31,
2021
are
not
necessarily indicative of the results that
may
be expected for the year ending
December 
31,
2021.
The unaudited interim consolidated financial statements presented herein do
not
contain the required disclosures under GAAP for annual financial statements. The accompanying unaudited interim consolidated financial statements should be read in conjunction with the annual audited financial statements and related notes as of and for the year ended
December 
31,
2020
filed with the SEC as part of the Company's Annual Report on Form
10
-K on
March 16, 2021.
Use of Estimates, Policy [Policy Text Block]
Use of Estimate
 
The preparation of unaudited interim consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of assets and liabilities at the date the financial statements and reported amounts of expense during the reporting period. The COVID-
19
pandemic had
no
material impact on the Company's estimates and assumptions used in the preparation of the unaudited interim consolidated financial statements for the quarterly period ended
March 31, 2021.
However, the full extent to which the ongoing COVID-
19
pandemic will directly or indirectly impact the Company's business, results of operations and financial condition, including sales, expenses, reserves and allowances, clinical studies, research and development costs and employee-related amounts, will depend on future developments that are highly uncertain, including as a result of new information that
may
emerge concerning COVID-
19,
governmental and business responses to the pandemic, further actions taken to contain or treat COVID-
19,
the ongoing economic impact on local, regional, national and international markets, and the speed of the anticipated economic recovery. Due to the uncertainty of factors surrounding these estimates or judgments, actual results
may
materially vary from estimates. Estimates and assumptions are periodically reviewed, and the effects of revisions are reflected in the unaudited interim consolidated financial statements in the period they are determined. The Company's future assessment of the magnitude and duration of COVID-
19,
as well as other factors, could result in material impacts to the consolidated financial statements in future reporting periods.
Fair Value of Financial Instruments, Policy [Policy Text Block]
Fair Value of Financial Instruments
 
The carrying amounts of the Company's financial instruments, including cash equivalents and accounts payable, approximate fair value due to the short-term nature of those instruments.         
Goodwill and Intangible Assets, Policy [Policy Text Block]
Intangible Asset
 
The Company's DFN-
529
(formerly RES-
529
) intangible asset is assessed for impairment annually on
October 1
of the Company's fiscal year or more frequently if impairment indicators exist. There was
no
impairment to the Company's DFN-
529
intangible asset recognized during the
three
months ended
March 
31,
2021
and
2020.
Earnings Per Share, Policy [Policy Text Block]
Net Loss Per Common Share
 
Basic net loss per share is computed by dividing net loss attributable to common stockholders by the weighted average number of shares of common stock outstanding during each period. Diluted net loss per share includes the effect, if any, from the potential exercise or conversion of securities, such as convertible debt, convertible preferred stock, common stock warrants, stock options and unvested restricted stock that would result in the issuance of incremental shares of common stock. In computing the basic and diluted net loss per share applicable to common stockholders, the weighted average number of shares remains the same for both calculations due to the fact that when a net loss exists, dilutive shares are
not
included in the calculation as the impact is anti-dilutive.
 
The following potentially dilutive securities outstanding as of
March 
31,
2021
and
2020
have been excluded from the computation of diluted weighted average shares outstanding, as they would be anti-dilutive:
 
   
March 31,
 
   
2021
   
2020
 
Common stock warrants
   
6,553,039
     
21,261,070
 
Stock options
   
3,116,819
     
1,182,629
 
Unvested restricted stock awards
   
153,000
     
98,100
 
     
9,822,858
     
22,541,799
 
New Accounting Pronouncements, Policy [Policy Text Block]
Recently Adopted Accounting Pronouncements
 
In
December 2019,
the FASB issued ASU
No.
2019
-
12,
Income Taxes (Topic
740
):
Simplifying the Accounting for Income Taxes
. This guidance applies to all entities and aims to reduce the complexity of tax accounting standards while enhancing reporting disclosures. This guidance is effective for fiscal years beginning after
December 15, 2020
and interim periods therein. The Company adopted ASU
No.
2019
-
12
in the
first
quarter of
2021
and the adoption did
not
have a material impact on the Company's consolidated financial statements.