Quarterly report pursuant to Section 13 or 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Other Current Assets) (Details)

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Other Current Assets) (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Accounting Policies [Abstract]    
Managed course receivables $ 4,997 $ 5,426
Prepaid expenses 2,253 3,608
Deposits 954 1,374
Inventory 2,529 2,762
Miscellaneous current assets, net 3,244 4,351
Other current assets $ 13,977 $ 17,521