Quarterly report pursuant to Section 13 or 15(d)

BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Cash, cash equivalents and restricted cash (Details)

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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Cash, cash equivalents and restricted cash (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES        
Cash and equivalents $ 24,317 $ 28,851    
Restricted cash   1,000    
Cash, cash equivalents and restricted cash $ 24,317 $ 29,851 $ 18,370 $ 20,634