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INVESTMENTS AND FAIR VALUE MEASUREMENTS (Tables)
 6 Months Ended
Jun. 30, 2020
Investments And Fair Value Disclosures [Abstract]  
Schedule of available for sale securities reconciliation
The following table represents the Company's investments in marketable securities and fair value measurements by investment category reported as cash equivalents and investments as of December 31, 2019 (in thousands):
December 31, 2019
 Amortized
Cost		Gross
Unrealized
Gains		Gross
 Unrealized
Losses		Fair
Value		Level 1Level 2Level 3
Cash equivalents$576,761  $—  $—  $576,761  $576,761  $—  $—  
Auction rate securities10,800  —  (730) 10,070  —  —  10,070  
Total cash equivalents and long-term investments
$587,561  $—  $(730) $586,831  $576,761  $—  $10,070  
Summary of fair value hierarchy for its financial assets and liabilities measured at fair value on a recurring basis
The following table represents the Company's investments in marketable securities and fair value measurements by investment category reported as cash equivalents and investments as of December 31, 2019 (in thousands):
December 31, 2019
 Amortized
Cost		Gross
Unrealized
Gains		Gross
 Unrealized
Losses		Fair
Value		Level 1Level 2Level 3
Cash equivalents$576,761  $—  $—  $576,761  $576,761  $—  $—  
Auction rate securities10,800  —  (730) 10,070  —  —  10,070  
Total cash equivalents and long-term investments
$587,561  $—  $(730) $586,831  $576,761  $—  $10,070