Cash, Cash Equivalents and Investments

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

The Company believes the unrealized losses on the Company’s investments are due to interest rate fluctuations. As these investments are short-term in nature, are expected to be redeemed at par value, and/or because the Company has the ability and intent to hold these investments to maturity, the Company does not consider these investments to be other than temporarily impaired at September 30, 2017 or as of December 31, 2016.