INCOME TAXES - Details of Significant Components of Net Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets:
Net operating loss carryforwards	$ 7,638	$ 9,239
State income taxes	1	1
Deferred revenue	4,502	5,426
Research and development and other credits	10,493	8,638
Reserve and accruals recognized in different periods	395	1,027
Capitalized research and development expenses	3,333	3,318
Depreciation and amortization	2,492	3,134
Lease liability	339	351
Total deferred tax assets	29,193	31,134
Valuation allowance	(27,239)	(28,475)
Deferred tax liabilities:	1,954	2,659
Right of use lease assets	(185)	(344)
Foreign credits	0	(14)
Other deferred tax liabilities	0	0
Total deferred tax liabilities	(185)	(358)
Net deferred taxes	$ 1,769	$ 2,301