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Fair Value Measurements
3 Months Ended
Jun. 30, 2021
Fair Value Disclosures [Abstract]  
Fair Value Measurements Fair Value Measurements
FASB ASC 820, Fair Value Measurements and Disclosures, establishes a three-tier fair value hierarchy for disclosure of fair value measurements as follows:
Level 1 - Unadjusted quoted prices in active markets for identical assets and liabilities.
Level 2 - Inputs (other than quoted prices included within Level 1) that are observable, unadjusted quoted prices in markets that are not active, or other inputs that are observable or can be corroborated by observable market data of substantially the full term of the related assets or liabilities.
Level 3 - Inputs reflect management’s best estimate of what market participants would use in pricing the asset or liability at the measurement date. Inputs are unobservable for the asset or liability. Consideration is given to the risk inherent in the valuation technique and the risk inherent in the inputs to the model.
The categorization of a financial instrument within the valuation hierarchy is based upon the lowest level of input that is significant to the fair value measurement. The following table summarizes the Company’s liabilities measured at fair value as of the dates presented, by level within the fair value hierarchy (in thousands):

Level 1Level 2Level 3
June 30, 2021
Promissory note$— $— $17,190 
March 31, 2021
Promissory note$— $— $16,128 
    
The following table includes the changes in fair value of the promissory note which are Level 3 on the fair value hierarchy (in thousands):
April 1, 2021$16,128 
Interest expense accrued38 
Increase in fair value1,024 
June 30, 2021$17,190 
January 1, 2021$15,392 
Interest expense accrued37 
Increase in fair value699 
March 31, 2021$16,128 

The Company recorded interest expense of $38 thousand and $37 thousand for the three months ended June 30, 2021 and 2020, respectively. Fair value of promissory note increased $1.0 million and $1.7 million for the three months ended June 30, 2021 and 2020, respectively.
There were no changes to our valuation techniques used to measure assets and liability fair values during the three months ended June 30, 2021 and 2020. The valuation techniques for the items in the table above are as follows:
Level 3 borrowings, which consist of a promissory note, are measured and reported at fair value using a Monte Carlo simulation valuation model. The models can include assumptions related to the value of the notes that are based on the estimated timing and amounts of future rounds of financing, including the estimated timing of a change in control of the Company, and estimated market interest rates, which represent significant unobservable inputs. Assumptions used are (1) the Company is worth today what it can generate in future cash to the Company, (2) cash received today is more than an equal amount of cash received in the future, and (3) future cash flows can be reasonably estimated. There were no transfers in or out of level 3 fair value instruments.
The following table summarizes assumptions used for fair value of promissory note as of the dates presented:
June 30, 2021March 31, 2021
Stock price$4.69$3.75
Time1.25 years1.5 years
Risk-free rate0.12%0.12%
Volatility43.7%50.6%