Fair Value of Financial Assets and Liabilitiest (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Mar. 31, 2016
Assets
Marketable securities - corporate bonds and mutual funds	$ 5,083	$ 6,025
Liabilities
Fair value of warrant liabilities	824	702
Quoted prices in active markets (Level 1) [Member]
Assets
Marketable securities - corporate bonds and mutual funds	480	211
Significant other observable inputs (Level 2) [Member]
Assets
Marketable securities - corporate bonds and mutual funds	4,603	5,814
Significant unobservable inputs (Level 3) [Member]
Assets
Marketable securities - corporate bonds and mutual funds
Liabilities
Fair value of warrant liabilities	$ 824	$ 702