CASH, CASH EQUIVALENTS, AND INVESTMENTS - Summary of Debt Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Cash and Cash Equivalents [Line Items]
Fair Value, Less than 12 Months		$ 31,445
Unrealized Losses, Less than 12 Months		(6)
Fair Value, 12 Months or Greater		0
Unrealized Losses 12 Months or Greater		0
Fair Value, Total	$ 0	31,445
Unrealized Losses, Total		(6)
Commercial paper
Cash and Cash Equivalents [Line Items]
Fair Value, Less than 12 Months		19,296
Unrealized Losses, Less than 12 Months		0
Fair Value, 12 Months or Greater		0
Unrealized Losses 12 Months or Greater		0
Fair Value, Total		19,296
Unrealized Losses, Total		0
Corporate debt securities
Cash and Cash Equivalents [Line Items]
Fair Value, Less than 12 Months		7,538
Unrealized Losses, Less than 12 Months		(2)
Fair Value, 12 Months or Greater		0
Unrealized Losses 12 Months or Greater		0
Fair Value, Total		7,538
Unrealized Losses, Total		(2)
Asset-backed securities
Cash and Cash Equivalents [Line Items]
Fair Value, Less than 12 Months		4,611
Unrealized Losses, Less than 12 Months		(4)
Fair Value, 12 Months or Greater		0
Unrealized Losses 12 Months or Greater		0
Fair Value, Total		4,611
Unrealized Losses, Total		$ (4)