5. INCOME TAXES - Deferred tax assets and liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Mar. 31, 2015
Deferred tax assets:
Deferred revenue	$ 231	$ 110
Tax credits	2,706	1,766
Net operating losses	1,356	1,165
Stock-based compensation	1,550	1,387
Property and equipment	297	193
Other reserves and accruals	1,175	1,407
Total deferred tax assets	7,315	6,028
Deferred tax liabilities:
Intangible assets	(856)
Unrecognized gains	(14)	(11)
Total deferred tax liabilities	(870)	(11)
Gross deferred tax assets	6,445	6,017
Valuation allowance	(7,256)	$ (6,017)
Net deferred tax liability	(811)
Undistributed earnings on which income taxes have not been provided	40,100
Deferred Tax Liabilities, Undistributed Foreign Earnings	$ 0