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CASH EQUIVALENTS AND MARKETABLE SECURITIES - (Tables)
 6 Months Ended
Jun. 30, 2021
Investments, Debt and Equity Securities [Abstract]  
Marketable Securities The table below summarizes the Company’s cash equivalents and marketable securities (in thousands):
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
(Losses)		Estimated
Fair Value
June 30, 2021
Assets
Cash equivalents:
Money market funds$57,371 $— $— $57,371 
Total57,371 — — 57,371 
Marketable securities:
U.S. government-sponsored entity debt securities160,310 26 — 160,336 
Commercial paper securities143,435 33 (3)143,465 
Corporate debt securities36,942 6 (10)36,938 
Asset-backed securities45,743 12 (13)45,742 
Certificate of deposits22,492 7 — 22,499 
Total408,922 84 (26)408,980 
Total cash equivalents and marketable securities$466,293 $84 $(26)$466,351 
December 31, 2020
Assets
Cash equivalents:
Money market funds$53,165 $— $— $53,165 
Total53,165 — — 53,165 
Marketable securities:
U.S. government-sponsored entity debt securities257,284 19 (5)257,298 
Commercial paper securities213,500 41 (8)213,533 
Corporate debt securities59,575 16 (17)59,574 
Asset-backed securities17,905 10 (7)17,908 
Certificate of deposits12,311 — — 12,311 
Total560,575 86 (37)560,624 
Total cash equivalents and marketable securities$613,740 $86 $(37)$613,789 
Fair value of investments available-for-sale The fair value of marketable securities by contractual maturity were as follows (in thousands):
June 30,
2021		December 31,
2020
Maturing in one year or less$359,775 $510,094 
Maturing after one year through five years49,205 50,530 
Total$408,980 $560,624