Cash, Cash Equivalents and Investments (Tables)

12 Months Ended

Dec. 31, 2014

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 December 31 (in thousands):

	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

	As of December 31, 2013
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Cash and Cash Equivalents		Short-Term Investments		Long-Term Investments
Cash	$	37,196	$	—	$	—		$	37,196	$	37,196	$	—	$	—
Level 1:
Money market funds	5,030		—		—			5,030		5,030		—		—
Corporate bonds	7,743		3		(14		)	7,732		—		1,102		6,641
Subtotal	12,773		3		(14		)	12,762		5,030		1,102		6,641
Level 2:
State and municipal obligations	10,807		14		—			10,821		45		5,626		5,136
Certificates of deposit	2,619		—		—			2,619		—		2,373		246
Subtotal	13,426		14		—			13,440		45		7,999		5,382
Total	$	63,395	$	17	$	(14	)	$	63,398	$	42,271	$	9,101	$	12,023

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 December 31, 2014 by contractual maturity (in thousands):

	Amortized Cost		Fair Value
Due in less than one year	$	32,774	$	33,773
Due after one year, through two years	9,048		9,032
Due after two years	248		248
Total short-term and long-term investments	$	42,070	$	43,053