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Note 6 - Fair Value of Financial Instruments
6 Months Ended
Jun. 30, 2017
Notes to Financial Statements  
Fair Value Disclosures [Text Block]
Note
6
 –
Fair Value of Financial Instruments
 
Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date.
 
Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of unobservable inputs. The fair value hierarchy is based on
three
levels of inputs, of which the
first
two
are considered observable and the last unobservable, as follows:
 
 
Level
1
– Quoted prices in active markets for identical assets and liabilities.
 
Level
2
– Inputs other than Level
1
that are observable, either directly or indirectly, such as quoted prices for similar assets or liabilities, quoted prices in markets that are
not
active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.
 
Level
3
– Unobservable inputs that are supported by little or
no
market activity and that are significant to the fair value of the assets or liabilities.
 
Fair Value on a Recurring Basis
 
The tables below categorize assets and liabilities measured at fair value on a recurring basis for the periods presented:
 
   
Fair Value
   
Fair value measurement using
 
   
June 30,
   
 
 
 
 
 
 
 
 
 
 
 
(in thousands)
 
2017
   
Level 1
   
Level 2
   
Level 3
 
                                 
Assets:
                               
Cash and cash equivalents
  $
2,528
    $
2,528
    $
-
    $
-
 
Certificate of deposit
   
225
     
225
     
-
     
-
 
Total Assets
  $
2,753
    $
2,753
    $
-
    $
-
 
 
   
Fair Value
   
Fair value measurement using
 
   
December 31,
   
 
 
 
 
 
 
 
 
 
 
 
(in thousands)
 
2016
   
Level 1
   
Level 2
   
Level 3
 
                                 
Assets:
                               
Cash and cash equivalents
  $
5,588
    $
5,588
    $
-
    $
-
 
Certificate of deposit
   
225
     
225
     
-
     
-
 
Total Assets
  $
5,813
    $
5,813
    $
-
    $
-
 
 
The following table summarizes changes in the fair value of common stock warrant liability
 measured on a recurring basis using Level
3
inputs for the
six
months ended
June 30, 2016
representing the write-off of the remaining liability upon expiration of the underlying warrants in
February 2016.
 
(in thousands)
 
 
 
 
           
Balance at January 1, 2016
 
$
223
 
Change in fair value of common stock warrant liability
   
(223
)
Balance at June 30, 2016
 
$
-
 
 
 
 
Fair Value of Long-Term Debt
 
At
June 30, 2017,
the estimated fair value of the Deerfield Loan (
see,
“– Note
7
– Long-term Debt”) was
$22.4
million, compared to a carrying value for current and non-current portions of
$25.0
million. The estimated fair value of the Deerfield Loan is based on discounting the future contractual cash flows to the present value at the valuation date. This analysis utilizes certain Level
3
unobservable inputs, including current cost of capital. Considerable judgment is required to interpret market data and to develop estimates of fair value. The estimates presented are
not
necessarily indicative of amounts that could be realized in a current market exchange. The use of alternative market assumptions and estimation methodologies could have a material effect on these estimates of fair value.  
The methodology and assumptions do
not
take into consideration the potential restructuring of the Deerfield Loan (
see
, “– Note
9
– Subsequent Events”).