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Fair Value Measurements
6 Months Ended
Sep. 30, 2022
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 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$16,128 
Interest expense accrued77 
Decrease in fair value(605)
Conversion(15,600)
March 31, 2022$ 
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 8 - Debts and Note 10 - Stockholders’ Equity.

The Company recorded interest expense of $36 thousand and $74 thousand for the three and six months ended September 30, 2021, respectively. Fair value of promissory note decreased by $1.6 million and $605 thousand for the three and six months ended September 30, 2021, respectively.