Annual report pursuant to Section 13 and 15(d)

Significant Accounting Policies (Details Textual)

v3.19.1
Significant Accounting Policies (Details Textual) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Jan. 01, 2019
Jan. 02, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Mar. 17, 2015
Equity Method Investment, Annual Equity Fee, Percentage   2.50%       2.50%
Fortress Biotech, Inc [Member]            
Equity Method Investment, Annual Equity Fee, Percentage 2.50%   2.50%      
Stock Issued During Period, Shares, New Issues 960,428 591,836        
Research and Development Expense [Member]            
Stock Issued During Period, Value, Issued for Services     $ 1.7 $ 2.3 $ 3.9