XML 97 R84.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Commitments and Contingencies (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Sep. 30, 2014
Commitments and Contingencies Disclosure [Abstract]      
Nonrecourse liability related to sale of future royalties; long term $ 19,248 $ 22,575 $ 30,000