Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2018

Fair Value Disclosures [Abstract]

Schedule of assets measured at fair value on a recurring basis

	Fair Value Measurement at March 31, 2018 Using:
	Quoted Prices in  Active Markets for Identical Assets		Significant Other Observable Inputs		Significant  Unobservable  Inputs
	(Level 1)		(Level 2)		(Level 3)
Money market funds (included in cash and cash equivalents)	$	50,148
Total	$	50,148	$	-	$	-

	Fair Value Measurement at December 31, 2017 Using:
	Quoted Prices in  Active Markets for Identical Assets		Significant Other Observable Inputs		Significant  Unobservable  Inputs
	(Level 1)		(Level 2)		(Level 3)
Money market funds (included in cash and cash equivalents)	$	49,986
Total	$	49,986	$	-	$	-