Cash and Cash Equivalents and Short Term Investments (Tables)

12 Months Ended

Dec. 31, 2018

Cash Cash Equivalents And Short Term Investments [Abstract]

Summary of Cash and Cash Equivalents

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,
	2018		2017
Cash	$	9,197	$	5,522
Money market funds		131,425		73,070
Total cash and cash equivalents	$	140,622	$	78,592

Summary of Amortized Cost And Recorded Basis of T-bills in Short Term Investments

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.

	December 31,
	2018		2017
Short-term investments	$	105,256	$	104,719