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Note 6 - Fair Value Measurements
 9 Months Ended
Dec. 31, 2019
Notes to Financial Statements  
Fair Value Disclosures [Text Block]
6.
Fair Value Measurements
 
A valuation hierarchy for disclosure of the inputs to valuation used to measure fair value has been established. This hierarchy prioritizes the inputs into
three
broad levels as follows:
 
Level 
1
 
-
Inputs are unadjusted quoted prices in active markets for identical assets or liabilities that the Company has the ability to access at the measurement date.
 
 
 
Level 
2
 
-
Inputs include quoted prices for similar assets and liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are
not
active, inputs other than quoted prices that are observable for the asset or liability, and inputs that are derived principally from or corroborated by observable market data by correlation or other means (market corroborated inputs).
 
 
 
Level 
3
 
-
Unobservable inputs that reflect the Company’s assumptions that market participants would use in pricing the asset or liability. The Company develops these inputs based on the best information available, including its own data.
 
The Company provides a gross presentation of activity within Level
3
measurement roll-forward and details of transfers in and out of Level
1
and
2
measurements.  A change in the hierarchy of an investment from its current level is reflected in the period during which the pricing methodology of such investment changes.  Disclosure of the transfer of securities from Level
1
to Level
2
or Level
3
is made in the event that the related security is significant to total cash and investments.  The Company did
not
have any transfers of assets and liabilities from Level
1,
Level
2
or Level
3
of the fair value measurement hierarchy during the
nine
months ended
December 31, 2019
.
 
A financial asset’s or liability’s classification within the hierarchy is determined based on the lowest level input that is significant to the fair value measurement.
 
The following table provides the assets and liabilities carried at fair value on a recurring basis, measured as of 
December 31, 2019
and 
March 31, 2019
(in thousands):
 
   
Total Carrying Value
    
Quoted Prices in Active Markets (Level 1)
    
Significant Other Observable Inputs (Level 2)
    
Significant Unobservable Inputs (Level 3)
  
December 31, 2019:
                                
Assets:
                                
Cash equivalents
   $
21,230
     $
21,230
     $
—
     $
—
  
Marketable securities   $
35,047
     $
35,047
     $
—
     $
—
  
 
   
Total Carrying Value
    
Quoted Prices in Active Markets (Level 1)
    
Significant Other Observable Inputs (Level 2)
    
Significant Unobservable Inputs (Level 3)
  
March 31, 2019:
                                
Assets:
                                
Cash equivalents
   $
41,839
     $
41,839
     $
—
     $
—
  
Derivative liabilities:
                                
Warrants
   $
4,942
     $
—
     $
—
     $
4,942
  
 
The table below reflects the activity for the Company’s major classes of liabilities measured at fair value on a recurring basis (in thousands):
 
   
Warrants
  
April 1, 2019
   $
4,942
  
Mark to market adjustment    
(4,648
 )
Exercise of in-the-money warrants    
(294
 )
Balance at December 31, 2019
   $
-
  
 
   
Warrants
  
April 1, 2018
   $
1,217
  
Mark to market adjustment
    
2,658
  
Balance at December 31, 2018
   $
3,875
  
 
Valuation Techniques
 
Cash Equivalents
 
Cash equivalents consist of highly liquid instruments with maturities of
three
months or less that are regarded as high quality, low risk investments, are measured using such inputs as quoted prices and are classified within Level
1
of the valuation hierarchy. Cash equivalents consist principally of certificates of deposits and money market accounts.
 
Marketable Securities
 
Marketable securities consist of certificates of deposit with maturities of greater than
12
months that are measured using such inputs as quoted prices and are classified within Level
1
of the valuation hierarchy. The Company determines the appropriate classification of its marketable securities at the time of purchase and re-evaluates such classification as of each balance sheet date.  All marketable securities are considered available for sale and are carried at fair value.   Changes in fair value would be recorded to other income/expense, net.   The Company periodically reviews the realizability of each short and long term marketable security when impairment indicators exist with respect to the security.  If other than temporary impairment of value of the security exists, the carrying value of the security is written down to its estimated fair value.  
 
Warrants
 
The Company issued warrants in conjunction with an equity offering to Hudson Bay Capital in
November 2014
and a Loan and Security Agreement with Hercules Technology Growth Capital, Inc. (“Hercules”). The warrants issued to Hercules were exercised on
April 8, 2019. 
The warrants issued to Hudson were partially exercised on
November 13, 2019
and the remaining unexercised warrants expired on
November 13, 2019. 
As of
December 31, 2019
the Company has
no
remaining outstanding warrants. 
 
The Company relied on various assumptions in a lattice model to determine the fair value of warrants. The Company had valued the warrants within Level
3
of the valuation hierarchy. See Note
13,
“Warrants and Derivative Liabilities,” for additional information including a discussion of the warrants and the valuation assumptions used.