Annual report pursuant to Section 13 and 15(d)

Significant Accounting Policies (Details 3)

v3.19.1
Significant Accounting Policies (Details 3) - Contingent Royalty Obligation [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning $ 1,662 $ 1,410
Change in estimated fair value of contingent royalty obligation 291 252
Balance at end $ 1,953 $ 1,662