STOCK-BASED COMPENSATION - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	6 Months Ended
	Mar. 31, 2021	Jun. 30, 2021	Jun. 30, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period		4 years
Weighted average period for recognition of compensation costs		1 year 7 months 6 days
Expiration period of stock option plan		10 years
Options granted to employees		0
Weighted average grant date fair value of options granted, per share			$ 1.20
Unrecognized compensation cost		$ 7,200
Restricted Stock Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average grant date fair value of RSUs granted		$ 4.78	$ 2.78
Restricted Stock Units (RSUs) | Employees and/or Board of Directors | Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period		3 years
Restricted Stock Units (RSUs) | Employees and/or Board of Directors | Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period		2 years
Incentive Stock Units (ISUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average grant date fair value of RSUs granted		$ 4.78
Total grant date fair value of ISUs		$ 15,100	$ 16,400
Total fair value of ISUs vested		18,300	$ 1,200
Unrecognized stock based compensation cost		$ 19,100
Weighted average period for recognition of compensation costs		1 year 10 months 24 days
Shares expected to vest		7,000,000.0
2015 and 2018 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares available for grant		5,600,000
2021 PSU Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of years of compound annual revenue growth rate used as metric to award performance share units	3 years
2015 Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Purchase price as a percentage of fair market value per share		85.00%
Common stock reserved for issuance		3,500,000
Number of common stock authorized for issuance		3,500,000
Shares issued under ESPP		300,000
Common stock remained available for issuance pursuant to the purchase plan		3,200,000
2015 Employee Stock Purchase Plan | Offering Period
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Maximum contribution percentage amount of employee's base compensation		15.00%
Maximum employee contribution in to share purchase plan per offering		$ 30,000
Maximum number of shares allowed for purchase by each employee		3,000