STOCKHOLDERS' EQUITY - Common stock reserved for future issuance (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
STOCKHOLDERS' EQUITY
Total shares reserved and available for future issuance of common stock	62,941,935	2,705,851
Number of shares held in abeyance	6,321,912
Value of shares held in abeyance	$ 0.9
Warrants
STOCKHOLDERS' EQUITY
Total shares reserved and available for future issuance of common stock	44,313	4,313
Awards outstanding under the 2017 and 2007 Equity Incentive Plans
STOCKHOLDERS' EQUITY
Total shares reserved and available for future issuance of common stock	201,663	234,147
Awards outstanding under the 2024 Equity Incentive Plan
STOCKHOLDERS' EQUITY
Total shares reserved and available for future issuance of common stock	66,327	35,818
Shares available for future issuance under convertible debt notes
STOCKHOLDERS' EQUITY
Total shares reserved and available for future issuance of common stock	16,556,727	212,329
Shares available for future issuance under equity line-of-credit agreement
STOCKHOLDERS' EQUITY
Total shares reserved and available for future issuance of common stock		704
Shares available for future issuance under the 2024 Equity Incentive Plan
STOCKHOLDERS' EQUITY
Total shares reserved and available for future issuance of common stock	18,910	59,273
Shares available for future conversion of Series P and P2 Preferred Stock and warrants
STOCKHOLDERS' EQUITY
Total shares reserved and available for future issuance of common stock	5,000,000
Shares authorized and available for future issuance
STOCKHOLDERS' EQUITY
Total shares reserved and available for future issuance of common stock	41,053,995	2,159,267