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Fair Value Measurements
12 Months Ended
Mar. 31, 2022
Fair Value Disclosures [Abstract]  
Fair Value Measurements Fair Value MeasurementsFASB 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
March 31, 2022
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):

January 1, 2020$16,169 
Interest expense accrued150 
Decrease in fair value(927)
December 31, 202015,392 
Interest expense accrued37 
Increase in fair value699 
March 31, 202116,128 
Interest expense accrued77 
Decrease in fair value(605)
Conversion(15,600)
March 31, 2022$ 
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 9 - Debts and Note 11 - Stockholders’ Equity (Deficit).

The Company recorded interest expense of $77 thousand for the year ended March 31, 2022, $37 thousand for the three months ended March 31, 2021 and $150 thousand for the year ended December 31, 2020. Fair value of promissory note decreased by $605 thousand for the year ended March 31, 2022, increased $699 thousand for the three months ended March 31, 2021 and decreased $927 thousand for the year ended December 31, 2020.

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:
March 31, 2021
Stock price$3.75
Time1.5 years
Risk-free rate0.12%
Volatility50.6%