Fair Value Of Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2017

Fair Value Of Financial Instruments [Abstract]

Fair Value Of Financial Assets Measured On A Recurring Basis

		June 30, 2017								December 31, 2016
Assets	Classification		Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
Money market funds	Cash and cash equivalents	$	1,708	$	—	$	—	$	1,708	$	1,726	$	—	$	—	$	1,726
Corporate bonds	Investments		—		11,901		—		11,901		—		13,289		—		13,289
Asset-backed security	Investments		—		1,508		—		1,508		—		1,017		—		1,017
Total assets measured at fair value		$	1,708	$	13,409	$	—	$	15,117	$	1,726	$	14,306	$	—	$	16,032