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FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)
 6 Months Ended
Jun. 30, 2020
Fair Value Disclosures [Abstract]  
Schedule of Financial Instruments Measured at Fair Value
The following table represents the fair value of the Company’s financial instruments, including those measured at fair value on a recurring basis, as of June 30, 2020 and December 31, 2019 as well as those held-to-maturity as of December 31, 2019 (in thousands):
June 30, 2020December 31, 2019
 Level 1Level 2Level 3TotalLevel 1Level 2Level 3Total
Cash equivalents: 
Money market funds$460,011  $—  $—  $460,011  $126,700  $—  $—  $126,700  
Commercial paper—  —  —  —  —  —  —  —  
Marketable securities:
Commercial paper—  —  —  —  —  130,472  —  130,472  
Corporate bonds—  —  —  —  —  85,611  —  85,611  
Agency bonds—  —  —  —  —  79,750  —  79,750  
Total cash equivalents and marketable securities$460,011  $—  $—  $460,011  $126,700  $295,833  $—  $422,533