Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Research and Development Expenses (Details)

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Research and Development Expenses (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Research And Development Expenses      
Clinical and preclinical trials $ 4,768 $ 3,809 $ 5,104
Salary and related expenses 909 888 664
Patents 229 234 198
Royalties 14 11 11
Laboratory materials 73 63 38
Rent 51 51 48
Depreciation 3 3 4
Others 28 47 48
Research and development expense $ 6,075 $ 5,106 $ 6,115