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Fair Value Measurements
9 Months Ended
Dec. 31, 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
December 31, 2021
Promissory note$— $— $— 
March 31, 2021
Promissory note$— $— $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$16,128 
Interest expense accrued77 
Increase in fair value(605)
Conversion(15,600)
December 31, 2021$ 
April 1, 2020$13,885 
Interest expense accrued150 
Increase in fair value2,093 
March 31, 2021$16,128 
On October 4, 2021, the promissory note of $15.6 million, consisting of an outstanding principal amount of $15.0 million plus accrued but unpaid interest of $600 thousand, was converted into an aggregate of 3,120,000 shares of common stock. See Note 6 - Debts and Note 9 - Stockholders’ Equity (Deficit).

The Company recorded interest expense of $3 thousand and $38 thousand for the three months ended December 31, 2021 and 2020, respectively. The Company recorded interest expense of $77 thousand and $113 thousand for the nine months ended December 31, 2021 and 2020, respectively. Fair value of promissory note decreased by $605 thousand for the nine months ended December 31, 2021. Fair value of promissory note decreased by $973 thousand and increased by $1.4 million for the three and nine months ended December 31, 2020, respectively.
Level 3 borrowings, which consist of 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.

The following table summarizes assumptions used for fair value of promissory note as of the dates presented:
December 31, 2021March 31, 2021
Stock price$3.75
Time1.5 years
Risk-free rate0.12%
Volatility50.6%