Fair Value of Financial Assets and Liabilitiest (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Assets
Marketable securities - mutual funds		$ 3,392
Marketable securities - preferred stock	$ 189
Marketable securities - corporate bonds	1,279
Total assets	1,468	3,392
Liabilities
Fair value of warrant liabilities	$ 1,417	2,959
Fair Value, Inputs, Level 1 [Member]
Assets
Marketable securities - mutual funds		$ 3,392
Marketable securities - preferred stock
Marketable securities - corporate bonds
Total assets
Liabilities
Fair value of warrant liabilities
Fair Value, Inputs, Level 2 [Member]
Assets
Marketable securities - mutual funds
Marketable securities - preferred stock	$ 189
Marketable securities - corporate bonds	1,279
Total assets	$ 1,468
Liabilities
Fair value of warrant liabilities
Fair Value, Inputs, Level 3 [Member]
Assets
Marketable securities - mutual funds
Marketable securities - preferred stock
Marketable securities - corporate bonds
Total assets
Liabilities
Fair value of warrant liabilities	$ 1,417	$ 2,959