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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2023
Accounting Policies [Abstract]  
Schedule of Fair Value Assumptions These two types of inputs have created the following fair-value hierarchy:
Level 1:
Quoted prices for identical instruments in active markets;
Level 2:
Quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, and model-derived valuations in which all significant inputs and significant value drivers are observable in active markets; and
Level 3:
Valuations derived from valuation techniques in which one or more significant inputs or significant value drivers are unobservable.
The table below presents the fair value per warrant and the valuation assumptions under the Black-Scholes OPM:
December 31, 2023December 31, 2022
Fair value per share$0.43 $0.17 
Warrants outstanding7,732,168 7,732,168 
Exercise price$11.50 $11.50 
Common stock price$2.85 $1.98 
Expected option term2.67 years3.67 years
Expected volatility74.20 %60.70 %
Risk-free rate of return4.00 %4.10 %
Expected annual dividend yield— %— %
Schedule of Supplemental Cash Flow Information
The table below presents supplemental cash flow information during the following periods:
Year Ended
December 31, 2023December 31, 2022
Supplemental cash flow information:
Cash paid (received) during the period for:
Interest
$9,082 $6,868 
Income taxes— — 
Non-cash investing and financing activities:
Convertible Preferred Stock dividends paid-in-kind
$19,741 $— 
Capital expenditures not yet paid
1,321 1,209 
Equity financing transaction costs not yet paid— 622 
Schedule of Property, Plant and Equipment, net
Expected useful lives for property, plant and equipment are reviewed at least annually. Estimated useful lives are as follows:
Estimated useful
life in years
Computer equipment
3
Furniture and fixtures
7
Laboratory equipment
3-10
Leasehold improvements
shorter of 5 or lease term
Assets subject to finance leaselease term
Property, plant and equipment, net were as follows:
 December 31, 2023December 31, 2022
United StatesEuropeTotalUnited StatesEuropeTotal
Computer equipment
$1,755 $559 $2,314 $1,256 $252 $1,508 
Furniture and fixtures
1,181 39 1,220 1,062 38 1,100 
Laboratory equipment
5,086 594 5,680 3,646 483 4,129 
Leasehold improvements
2,764 4,683 7,447 2,229 4,475 6,704 
Finance lease ROU assets— 2,004 2,004 — 944 944 
Construction in process3,782 — 3,782 1,408 — 1,408 
Property, plant and equipment, gross14,568 7,879 22,447 9,601 6,192 15,793 
Less: accumulated depreciation
(4,631)(1,907)(6,538)(2,785)(247)(3,032)
Total property, plant and equipment, net$9,937 $5,972 $15,909 $6,816 $5,945 $12,761 
The table below presents the depreciation expense related to property, plant and equipment for the following periods:
Year Ended
 December 31, 2023December 31, 2022
Depreciation expense
$3,512 $3,325 
Schedule Of Costs Of Advertising The table below presents the advertising cost for the following periods:
Year Ended
December 31, 2023December 31, 2022
Advertising costs$1,199 $1,306