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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Changes in Accumulated Other Comprehensive Income (Loss)                
Beginning Balance     $ (1,422)     $ (750) $ (1,422) $ (750)
Other comprehensive income (loss) before reclassifications             787 (871)
Amounts reclassified from accumulated other comprehensive loss             616 215
Net current period change in accumulated other comprehensive loss, before tax             1,403  
Income tax expense related to items of other comprehensive income             (341)  
Net current period change in accumulated other comprehensive income (loss) $ (2,120) $ 1,406 1,776 $ 472 $ 458 (1,586)   (656)
Ending Balance (360)     (1,406)     (360) (1,406)
Foreign Currency Translation Adjustments                
Changes in Accumulated Other Comprehensive Income (Loss)                
Beginning Balance     (25)     (61) (25) (61)
Other comprehensive income (loss) before reclassifications             (28) 12
Net current period change in accumulated other comprehensive loss, before tax             (28)  
Net current period change in accumulated other comprehensive income (loss)               12
Ending Balance (53)     (49)     (53) (49)
Unrealized Gain (Loss) on Marketable Securities                
Changes in Accumulated Other Comprehensive Income (Loss)                
Beginning Balance     $ (1,397)     $ (689) (1,397) (689)
Other comprehensive income (loss) before reclassifications             815 (883)
Amounts reclassified from accumulated other comprehensive loss             616 215
Net current period change in accumulated other comprehensive loss, before tax             1,431  
Income tax expense related to items of other comprehensive income             (341)  
Net current period change in accumulated other comprehensive income (loss)               (668)
Ending Balance $ (307)     $ (1,357)     $ (307) $ (1,357)