10. ACQUISITION (Details)		6 Months Ended
	Nov. 23, 2015 USD ($) employee patent	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)
Acquisition disclosure
Contingent consideration liability			$ 5,936,000	$ 5,856,000
Assets acquired and liabilities assumed
Goodwill			7,978,000	8,030,000
MikaMonu
Acquisition disclosure
Number of former shareholders receiving retention payments | employee	3
Cash paid for acquisition	$ 4,400,000
Contingent consideration, acquisition date fair value	2,500,000
Amount of payment held in escrow	$ 484,000
Term of additional contingent payments	4 years
Discount rate (as a percent)	14.80%
Contingent consideration liability	$ 5,800,000
Change in contingent consideration liability		$ 40,000
Assets acquired and liabilities assumed
Cash and cash equivalents	1,000
Other receivables	54,000
Property and equipment, net	10,000
Intangible assets	3,500,000
Goodwill	8,030,000	$ (52,000)
Total assets acquired	11,595,000
Accrued expenses	(10,000)
Net deferred tax liability	(821,000)
Total liabilities assumed	(831,000)
Fair value of net assets acquired	10,764,000
MikaMonu | Patents
Assets acquired and liabilities assumed
Intangible assets	$ 3,500,000
Useful life	15 years
MikaMonu | Other assets
Acquisition disclosure
Amount of payment held in escrow	$ 2,500,000
MikaMonu | Other accrued expenses
Acquisition disclosure
Contingent consideration			5,900,000	$ 5,900,000
MikaMonu | United States
Acquisition disclosure
Number of patents held | patent	12
MikaMonu | Continued employment of key employees
Acquisition disclosure
Contingent consideration			1,300,000
MikaMonu | Continued employment of Dr. Avidan Akerib
Acquisition disclosure
Contingent consideration	$ 1,200,000
MikaMonu | Product development milestones and revenue targets
Acquisition disclosure
Term of additional contingent payments	10 years
MikaMonu | Product development milestones and revenue targets | Maximum
Acquisition disclosure
Contingent consideration			$ 38,800,000
MikaMonu | Product development milestones to be achieved by December 31, 2017
Acquisition disclosure
Contingent consideration	$ 750,000
MikaMonu | Revenue milestones to be achieved by January, 1 2021
Acquisition disclosure
Contingent consideration	2,750,000
MikaMonu | Revenue milestones to be achieved by January, 1 2022
Acquisition disclosure
Contingent consideration	4,000,000
MikaMonu | Quarterly payments based on net revenue | Maximum
Acquisition disclosure
Contingent consideration	$ 30,000,000
Contingent consideration, percent of net revenue	5.00%