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ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - IPO (Details)
$ / shares in Units, $ in Millions
May 16, 2019
USD ($)
$ / shares
shares
Apr. 26, 2019
Sep. 30, 2019
shares
Dec. 31, 2018
shares
IPO        
Convertible preferred stock, outstanding (in shares) 0   0 7,095,746
IPO        
IPO        
Shares issued (in shares) 4,000,000      
Issue price (in dollars per share) | $ / shares $ 10.00      
Aggregate gross proceeds from issuance | $ $ 40.0      
Net proceeds after deducting underwriting discounts and commissions and estimated offering costs | $ $ 34.6      
Stock split ratio   55.2486    
Number of shares into which convertible preferred stock are converted 7,538,671      
Number of shares issued for each share of convertible preferred stock converted 1