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FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)
9 Months Ended
Sep. 30, 2023
Fair Value Disclosures [Abstract]  
Schedule of Assets and Liabilities Measurements on a Recurring Basis
As of September 30, 2023 and December 31, 2022, the Company’s financial assets and liabilities measured and recorded at fair value on a recurring basis were classified within the fair value hierarchy as follows (in thousands):
September 30, 2023December 31, 2022
Level 1Level 2Level 3TotalLevel 1Level 2Level 3Total
Assets
Cash equivalents$60,349 $129,261 $— $189,610 $51,250 $— $— $51,250 
Restricted cash equivalents - current33,277 — — 33,277 68,850 — — 68,850 
Restricted cash equivalents - noncurrent151,513 — — 151,513 94,781 — — 94,781 
Investments:
Commercial paper, available for sale— 9,866 — 9,866 — 32,756 — 32,756 
Corporate Bonds, available for sale— — — — — 58,442 — 58,442 
US Treasury Notes, Available for sale2,160 — — 2,160 — — — — 
Municipal bonds, available for sale— — — — — 7,394 — 7,394 
Total investments$2,160 $9,866 $— $12,026 $— $98,592 $— $98,592 
Liabilities
Warrant liability:
RTI warrants$— $— $2,185 $2,185 $— $— $3,670 $3,670 
Private warrants— — 493 493 — — 784 784 
Series A warrants— 35,536 — 35,536 — 51,429 — 51,429 
Total warrant liability$— $35,536 $2,678 $38,214 $— $51,429 $4,454 $55,883 
Fair Value Measurement Inputs
The private warrants are measured at fair value on a recurring basis using a Black-Scholes model. The private warrants are classified as Level 3 and were valued using the following assumptions:
September 30, 2023December 31, 2022
Expected annual dividend yield— %— %
Expected volatility101.1 %105.1 %
Risk-free rate of return4.9 %4.2 %
Expected option term (years)2.53.2
The Company has determined its warrant to be a Level 3 fair value measurement and has remeasured using a Binomial Tree option pricing model to calculate its fair value using the following assumptions:
September 30, 2023December 31, 2022
Expected annual dividend yield— %— %
Expected volatility89.5 %99.7 %
Risk-free rate of return5.3 %4.4 %
Expected option term (years)1.32.0
Level 3 Liabilities Measured at Fair Value
A summary of the private warrants activity from December 31, 2022 to September 30, 2023 is as follows:
Fair value
(Level 3)
Balance at December 31, 2022$784 
Change in fair value(291)
Balance at September 30, 2023$493 
Changes in Level 3 liabilities measured at fair value from December 31, 2022 to September 30, 2023 are as follows (in thousands):
Fair value
(Level 3)
Balance at December 31, 2022$3,670 
Change in fair value(1,485)
Balance at September 30, 2023$2,185