Fair Value Of Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2019

Fair Value Of Financial Instruments [Abstract]

Fair Value Of Financial Assets Measured On A Recurring Basis

		June 30, 2019								December 31, 2018
Assets	Classification		Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
Money market funds	Cash and cash equivalents	$	9,340	$	—	$	—	$	9,340	$	50,703	$	—	$	—	$	50,703
U.S. Treasury Securities	Investments		—		31,862		—		31,862		—		8,480		—		8,480
Total assets measured at fair value		$	9,340	$	31,862	$	—	$	41,202	$	50,703	$	8,480	$	—	$	59,183