The following tables summarize the Company's cash, cash equivalents, and held-to-maturity investments at September 30, 2017 and December 31, 2016 (in thousands):



	As of September 30, 2017
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Cash and Cash Equivalents		Short-Term Investments		Long-Term Investments
Cash	$	33,825	$	—	$	—		$	33,825	$	33,825	$	—	$	—

Level 1:
Money market funds	9,646		—		—			9,646		9,646		—		—
Corporate bonds	17,403		—		(10		)	17,393		—		17,403		—
Subtotal	27,049		—		(10		)	27,039		9,646		17,403		—

Level 2:
State and municipal obligations	969		—		—			969		—		969		—
Certificates of deposit	—		—		—			—		—		—		—
Subtotal	969		—		—			969		—		969		—
Total	$	61,843	$	—	$	(10	)	$	61,833	$	43,471	$	18,372	$	—



	As of December 31, 2016
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Cash and Cash Equivalents		Short-Term Investments		Long-Term Investments
Cash	$	32,802	$	—	$	—		$	32,802	$	32,802	$	—	$	—

Level 1:
Money market funds	7,849		—		—			7,849		7,849		—		—
Corporate bonds	33,379		—		(57		)	33,322		—		33,379		—
Subtotal	41,228		—		(57		)	41,171		7,849		33,379		—

Level 2:
State and municipal obligations	14,477		—		(10		)	14,467		—		14,243		234
Certificates of deposit	793		—		—			793		—		793		—
Subtotal	15,270		—		(10		)	15,260		—		15,036		234
Total	$	89,300	$	—	$	(67	)	$	89,233	$	40,651	$	48,415	$	234