Cash, Cash Equivalents and Investments (Tables)

12 Months Ended

Dec. 31, 2018

Cash And Cash Equivalents [Abstract]

Cash and Cash Equivalents

Cash and cash equivalents consisted of the following:

	As of December 31,
	2018		2017
Cash	$	19,603	$	18,811
Money market funds		15,070		7,155
Total cash and cash equivalents	$	34,673	$	25,966

Short-term and Long-term Investments

Short-term and long-term investments consisted of the following:

	December 31, 2018
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Short-term and long-term investments:
U.S. Treasury securities	$	500	$	—	$	—	$	500
Government agency bonds		—		—		—	$	—
Municipal bonds		—		—		—	$	—
Corporate bonds	$	—		—		—	$	—
Total short-term and long-term investments	$	500	$	—	$	—	$	500

	December 31, 2017
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Short-term and long-term investments:
U.S. Treasury securities	$	1,499	$	—	$	(6	)	$	1,493
Government agency bonds		1,003		—		(4	)	$	999
Municipal bonds		4,169		—		(14	)	$	4,155
Corporate bonds		1,502		—		(3	)	$	1,499
Total short-term and long-term investments	$	8,173	$	—	$	(27	)	$	8,146