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EQUITY INCENTIVE PLANS​ - Narrative (Details)
$ / shares in Units, shares in Thousands, $ in Millions
6 Months Ended
Jun. 30, 2024
USD ($)
$ / shares
shares
Board of directors  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Issuance of common stock for services (in shares) 41
ESPP shares issuable  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Issuance of common stock under employee stock purchase plan (in shares) 300
Purchase price (in dollars per share) | $ / shares $ 4.10
Proceeds from ESPP | $ $ 1.0