Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Service Agreements (Details)

v3.19.3.a.u2
Commitments and Contingencies - Service Agreements (Details) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Tissue Processing Agreement [Member]        
Service Agreements        
License fee amount   $ 2,148 $ 1,931 $ 1,409
Master Services Agreement For Clinical Research and Related Services [Member]        
Service Agreements        
Service agreement amount paid upon execution of agreement $ 151