Fair Value Of Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2017

Fair Value Of Financial Instruments [Abstract]

Fair Value Of Financial Assets Measured On A Recurring Basis

		March 31, 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	$	1,937	$	—	$	—	$	1,937	$	1,726	$	—	$	—	$	1,726
Corporate bonds	Cash and cash equivalents		—		500		—		500		—		—		—		—
Corporate bonds	Investments		—		14,590		—		14,590		—		13,289		—		13,289
Asset-backed security	Investments		—		1,519		—		1,519		—		1,017		—		1,017
Total assets measured at fair value		$	1,937	$	16,609	$	—	$	18,546	$	1,726	$	14,306	$	—	$	16,032