Annual report pursuant to Section 13 and 15(d)

Significant Accounting Policies (Details 4)

v3.20.1
Significant Accounting Policies (Details 4) - Contingent Royalty Obligation [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning $ 1,953 $ 1,662
Change in estimated fair value of contingent royalty obligation (81) 291
Balance at ending $ 1,872 $ 1,953