Condensed Consolidated Balance Sheets (unaudited) - USD ($)	Jun. 30, 2024	Dec. 31, 2023
Current assets
Cash and cash equivalents	$ 168,114	$ 1,151,823
Accounts receivable, net	25,402	103,316
Prepaid expenses and other current assets	379,257	324,735
Total current assets	572,773	1,579,874
Property and equipment, net	1,155,216
Finance lease right-of-use assets, net		138
Operating lease right-of-use assets	839,302
Other noncurrent assets	302,262	302,262
Total assets	2,869,553	1,882,274
Current liabilities
Accounts payable	128,369	111,149
Accrued compensation and benefits	374,939	127,601
Accrued liabilities	565,308	135,476
Deferred revenue		25,926
EIB loan guaranty	11,099,253	10,873,867
Short-term insurance financing	270,833
Short-term finance lease liabilities		280
Short-term operating lease liabilities	160,480	147,943
Total current liabilities	12,599,182	11,422,242
Long-term operating lease liabilities, net of short-term amount	1,938,571	2,021,616
Total liabilities	14,537,753	13,443,858
Stockholders’ deficit
Common stock, $0.01 par value; 100,000,000 shares authorized; 1,348,974 and 1,282,686 shares issued and outstanding at June 30, 2024 and December 31, 2023, respectively	13,490	12,827
Additional paid-in capital	295,094,492	293,991,529
Accumulated deficit	(306,781,684)	(305,493,302)
Accumulated other comprehensive loss		(75,138)
Total stockholders’ deficit	(11,668,200)	(11,561,584)
Total liabilities and stockholders’ deficit	2,869,553	1,882,274
Preferred Stock Series D [Member]
Stockholders’ deficit
Preferred stock, value	2	2,500
Preferred Stock Series E [Member]
Stockholders’ deficit
Preferred stock, value	$ 5,500