Annual report pursuant to Section 13 and 15(d)

Significant Accounting Policies (Details 2)

v3.19.1
Significant Accounting Policies (Details 2) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Assets    
Short-term investments $ 3,043  
Liabilities    
Contingent royalty obligation 1,953 $ 1,662
Level 1 [Member]    
Assets    
Short-term investments 3,043  
Liabilities    
Contingent royalty obligation
Level 2 [Member]    
Assets    
Short-term investments  
Liabilities    
Contingent royalty obligation
Level 3 [Member]    
Assets    
Short-term investments  
Liabilities    
Contingent royalty obligation $ 1,953 $ 1,662