5. INCOME TAXES - Deferred tax assets and liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Mar. 31, 2016
Deferred tax assets:
Deferred revenue	$ 330	$ 231
Tax credits	3,387	2,706
Net operating losses	2,264	1,356
Stock-based compensation	1,386	1,550
Property and equipment	425	297
Other reserves and accruals	1,167	1,175
Total deferred tax assets	8,959	7,315
Deferred tax liabilities:
Intangible assets	(13)	(856)
Unrecognized gains		(14)
Total deferred tax liabilities	(13)	(870)
Net deferred tax assets	8,946	6,445
Valuation allowance	(8,939)	(7,256)
Net deferred tax assets	7
Net deferred tax liability		$ (811)
Undistributed earnings on which income taxes have not been provided	45,000
Deferred tax liabilities, undistributed foreign earnings	$ 0