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Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
CURRENT ASSETS:    
Cash and cash equivalents $ 11,210 $ 43,356
Marketable securities 60,293 43,104
Accounts receivable, net 216 77
Inventories, net 1,003 1,015
Prepaid and other current assets 1,601 2,081
Total current assets 74,323 89,633
Right-of-use assets 1,281 441
Property and equipment, net 783 577
Other noncurrent assets 189 242
Total assets 76,576 90,893
CURRENT LIABILITIES:    
Accounts payable 3,765 3,615
Accrued expenses and other current liabilities 3,099 4,957
Total current liabilities 6,864 8,572
Operating lease liabilities, noncurrent 803 235
Convertible note, noncurrent 146 146
Other noncurrent liabilities 449 598
Total liabilities 8,262 9,551
COMMITMENTS AND CONTINGENCIES (Note 16)
STOCKHOLDERS’ EQUITY:    
Preferred stock—$0.0001 par value: 1,000,000 shares authorized; no shares issued and outstanding 0 0
Common stock—$0.0001 par value: 600,000,000 shares authorized; 46,488,312 and 45,169,913 shares issued and outstanding at June 30, 2026 and December 31, 2025 5 4
Additional paid-in capital 493,827 488,361
Accumulated other comprehensive (loss) income (98) 30
Accumulated deficit (425,420) (407,053)
Total stockholders’ equity 68,314 81,342
Total liabilities and stockholders’ equity $ 76,576 $ 90,893