STOCK-BASED COMPENSATION - Summary of Company's Stock Option Activity and Related Information (Detail) $ / shares in Units, $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2021 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares
Number of Stock Options Outstanding
Number of Stock Options Outstanding, Beginning balance | shares	8,142,348
Number of Stock Options Outstanding, Options granted | shares	0
Number of Stock Options Outstanding, Options exercised | shares	(43,651)
Number of Stock Options Outstanding, Options cancelled or forfeited | shares	(680,493)
Number of Stock Options Outstanding, Ending balance | shares	7,418,204	8,142,348
Number of Stock Options Outstanding, Options exercisable | shares	5,452,385
Number of Stock Options Outstanding, Options vested and expected to vest | shares	7,260,596
Weighted- Average Exercise Price
Weighted- Average Exercise Price, Beginning balance | $ / shares	$ 7.14
Weighted- Average Exercise Price, Options granted | $ / shares	0
Weighted- Average Exercise Price, Options exercised | $ / shares	4.26
Weighted- Average Exercise Price, Options cancelled or forfeited | $ / shares	9.20
Weighted- Average Exercise Price, Ending balance | $ / shares	6.97	$ 7.14
Weighted- Average Exercise Price, Options exercisable | $ / shares	6.94
Weighted- Average Exercise Price, Options vested and expected to vest | $ / shares	$ 7.00
Weighted- Average Remaining Contractual Life (Years)
Options Outstanding, Weighted- Average Remaining Contractual Life (Years)	6 years 8 months 12 days	7 years 3 months 18 days
Weighted- Average Remaining Contractual Life (Years), Options exercisable	6 years 3 months 18 days
Weighted- Average Remaining Contractual Life (Years), Options vested and expected to vest	6 years 7 months 6 days
Aggregate Intrinsic Value
Aggregate Intrinsic Value | $	$ 7,905	$ 2,638
Aggregate Intrinsic Value, Options exercisable | $	5,559
Aggregate Intrinsic Value, Options vested and expected to vest | $	$ 7,573