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ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Stock issued (Details)
$ / shares in Units, $ in Millions
Jan. 28, 2020
USD ($)
$ / shares
shares
Nov. 12, 2019
USD ($)
$ / shares
shares
May 16, 2019
USD ($)
$ / shares
shares
Apr. 26, 2019
Mar. 31, 2020
shares
Dec. 31, 2019
shares
IPO            
Convertible preferred stock, outstanding (in shares)     0   0 0
IPO            
IPO            
Issuance of common stock (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 offering costs | $     $ 34.6      
Stock split ratio       55.2486    
Conversion of convertible preferred stock into common stock upon closing of the IPO (in shares)     7,538,671      
Number of shares issued for each share of convertible preferred stock converted     1      
Private Placement            
IPO            
Issuance of common stock (in shares)   1,380,344        
Issue price (in dollars per share) | $ / shares   $ 14.50        
Net proceeds after deducting underwriting discounts and commissions and offering costs | $   $ 18.4        
Secondary Public Offering            
IPO            
Issue price (in dollars per share) | $ / shares $ 45.50          
Net proceeds from issuance of common stock | $ $ 134.1          
Secondary Public Offering, Excluding Underwriters' Option            
IPO            
Issuance of common stock (in shares) 2,741,489          
Underwriters' Option            
IPO            
Issuance of common stock (in shares) 411,223