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Fair Value Measurements
12 Months Ended
Mar. 31, 2023
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.

Promissory Note
The Yaskawa promissory note was categorized as a Level 3 borrowing, 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:
3/31/20223/31/2021
Stock price$3.75
Time1.5 years
Risk-free rate0.12%
Volatility50.6%
The following table includes the changes in fair value of the promissory note (in thousands):
March 31, 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 $0.6 million, was converted into an aggregate of 3,120,000 shares of common stock. See Note 11 - Debts and Note 13 - Stockholders’ Equity.
Foreign Currency Forward and Option Contracts
During the year ended March 31, 2023, the Company entered into four quarterly tiered collar contracts consisting of foreign currency forward and option contracts to manage the foreign exchange risk associated with certain foreign currency-denominated assets and liabilities, specifically those associated with its Japanese operations. The contracts have quarterly maturities ending January 2024.
As a result of foreign currency fluctuations, the U.S. dollar equivalent values of the Company’s foreign currency-denominated assets and liabilities change. The Company has not elected to account for these contracts as hedge instruments and as such, gains and losses on these contracts are included in other income (expense), net in the Company's consolidated statements of operations, along with foreign currency gains and losses of the related foreign currency-denominated assets and liabilities associated with these foreign currency forward and option contracts. During year ended March 31, 2023 the Company recognized net gains of $14 thousand associated with these contracts.
As the forward contract and option model employs market observable inputs such as spot currency rates and forward points, the Company has determined that the inputs used to value its derivatives fall within Level 2 of the fair value hierarchy. As of March 31, 2023 the fair value of the Company’s derivative assets were $7 thousand and there were no derivative liabilities. The Company had no derivative assets or liabilities as of March 31, 2022.
The following table presents the fair value of derivative instruments recognized in the Company's consolidated balance sheets as of March 31, 2023 (in thousands):
Derivative Not Designated as Hedging InstrumentsGross Amounts of Recognized Assets and LiabilitiesGross Amounts Offset in the Balance SheetNet Amounts of Assets and Liabilities Presented in the Balance Sheet
Prepaid expenses and other current assets$$$— $
Net$7 $7 $ $7