Cash and Cash Equivalents and Short Term Investments

12 Months Ended

Dec. 31, 2017

Marketable Securities Current [Abstract]

Cash and Cash equivalents and Short-term investments

Note 3: Cash and Cash equivalents and Short-term investments

a. Cash and cash equivalents:

Cash equivalents include items almost as liquid as cash, such as certificates of deposit and time deposits with maturity periods of three months or less when purchased.

	December 31,
	2017		2016
Cash	$	5,522	$	29,915
Money market funds		73,070		69,865
Total cash and cash equivalents	$	78,592	$	99,780

b. Short-term investments

The Company invests in marketable U.S. Treasury Bills (“T-bills”) that are classified as held-to-maturity securities. The amortized cost and recorded basis of the T-bills are presented as short-term investments in the amount of $104,719 and $119,854, as of December 31, 2017 and 2016, respectively and their estimated fair value as of December 31, 2017 and 2016 was $104,655 and $119,825, respectively.