Cash, Cash Equivalents and Investments (Tables)

9 Months Ended

Sep. 30, 2015

Cash and Cash Equivalents [Abstract]

Summary of Cash, Cash Equivalents and Held-to-Maturity Investments by Type

The following tables summarize the Company's cash, cash equivalents, and held-to-maturity investments at September 30, 2015 and December 31, 2014 (in thousands):

	As of September 30, 2015
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Cash and Cash Equivalents		Short-Term Investments		Long-Term Investments
Cash	$	45,065	$	—	$	—		$	45,065	$	45,065	$	—	$	—
Level 1:
Money market funds	762		—		—			762		762		—		—
Corporate bonds	36,216		4		(30		)	36,190		—		34,035		2,181
Subtotal	36,978		4		(30		)	36,952		762		34,035		2,181
Level 2:
State and municipal obligations	18,683		29		(3		)	18,709		60		12,675		5,948
Certificates of deposit	3,858		—		—			3,858		—		2,816		1,042
Subtotal	22,541		29		(3		)	22,567		60		15,491		6,990
Total	$	104,584	$	33	$	(33	)	$	104,584	$	45,887	$	49,526	$	9,171

	As of December 31, 2014
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Cash and Cash Equivalents		Short-Term Investments		Long-Term Investments
Cash	$	44,260	$	—	$	—		$	44,260	$	44,260	$	—	$	—
Level 1:
Money market funds	3,932		—		—			3,932		3,932		—		—
Corporate bonds	20,388		—		(34		)	20,354		—		15,656		4,732
Subtotal	24,320		—		(34		)	24,286		3,932		15,656		4,732
Level 2:
State and municipal obligations	19,145		18		—			19,163		175		15,891		3,079
Certificates of deposit	2,712		—		—			2,712		—		1,227		1,485
Subtotal	21,857		18		—			21,875		175		17,118		4,564
Total	$	90,437	$	18	$	(34	)	$	90,421	$	48,367	$	32,774	$	9,296

Summary of Amortized Cost and Fair Value of Short-term and Long-term Investments

The following table summarizes the amortized cost and fair value of the short-term and long-term investments held by the Company at September 30, 2015 by contractual maturity (in thousands):

	Amortized Cost		Fair Value
Due in less than one year	$	49,526	$	49,512
Due after one year, through two years	9,171		9,185
Due after two years	—		—
Total short-term and long-term investments	$	58,697	$	58,697