Quarterly report pursuant to Section 13 or 15(d)

Significant Accounting Policies - Additional Information (Details)

v3.20.1
Significant Accounting Policies - Additional Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Jan. 01, 2020
Dec. 31, 2019
Mar. 17, 2015
Equity Method Investment, Annual Equity Fee, Percentage     2.50%
Fortress Biotech, Inc [Member]      
Equity Method Investment, Annual Equity Fee, Percentage 2.50%    
Stock Issued During Period, Shares, New Issues 1,459,305    
Research and development [Member]      
Stock Issued During Period, Value, Issued for Services   $ 2.5