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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Fair value Instruments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Fair value measurements    
Equity investments with readily determinable fair values $ 300 $ 600
Impairment or price adjustments for strategic investments 0  
Loss on equity securities 300  
Carrying Value    
Fair value measurements    
Long-term debt 91,000 155,800
Carrying Value | Other Assets    
Fair value measurements    
Strategic investments 23,100 20,100
Level 2 | Estimated Fair Value    
Fair value measurements    
Long-term debt 91,600 159,200
Recurring basis    
Fair value measurements    
Total assets and liabilities measured at fair value 17,151 60,367
Recurring basis | Interest rate swap    
Fair value measurements    
Derivative liabilities 140 52
Recurring basis | Certificate of deposit    
Fair value measurements    
Cash and cash equivalents 380 391
Recurring basis | Money market funds    
Fair value measurements    
Cash and cash equivalents 2,266 2,894
Recurring basis | Short Term Investments    
Fair value measurements    
Investments 393 7,076
Recurring basis | Commercial paper    
Fair value measurements    
Cash and cash equivalents 13,972 49,954
Recurring basis | Level 1    
Fair value measurements    
Total assets and liabilities measured at fair value 2,659 3,449
Recurring basis | Level 1 | Money market funds    
Fair value measurements    
Cash and cash equivalents 2,266 2,894
Recurring basis | Level 1 | Short Term Investments    
Fair value measurements    
Investments 393 555
Recurring basis | Level 2    
Fair value measurements    
Total assets and liabilities measured at fair value 14,492 56,918
Recurring basis | Level 2 | Interest rate swap    
Fair value measurements    
Derivative liabilities 140 52
Recurring basis | Level 2 | Certificate of deposit    
Fair value measurements    
Cash and cash equivalents 380 391
Recurring basis | Level 2 | Short Term Investments    
Fair value measurements    
Investments   6,521
Recurring basis | Level 2 | Commercial paper    
Fair value measurements    
Cash and cash equivalents $ 13,972 $ 49,954