Statements of Changes In Shareholders' Equity (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Follow-on public offering
Issuance expenses, amount	$ 1,505	$ 1,117	$ 1,099
At-the-market offering
Issuance expenses, amount	236	$ 467	$ 468
Investing agreement
Issuance expenses, amount	$ 830