Cash, Cash Equivalents and Investments (Tables)

6 Months Ended

Jun. 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 June 30, 2015 and December 31, 2014 (in thousands):

	As of June 30, 2015
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Cash and Cash Equivalents		Short-Term Investments		Long-Term Investments
Cash	$	37,225	$	—	$	—		$	37,225	$	37,225	$	—	$	—
Level 1:
Money market funds	2,649		—		—			2,649		2,649		—		—
Corporate bonds	34,478		—		(53		)	34,425		—		30,038		4,440
Subtotal	37,127		—		(53		)	37,074		2,649		30,038		4,440
Level 2:
State and municipal obligations	20,276		19		(3		)	20,292		480		13,500		6,296
Certificates of deposit	4,355		—		—			4,355		—		2,714		1,641
Subtotal	24,631		19		(3		)	24,647		480		16,214		7,937
Total	$	98,983	$	19	$	(56	)	$	98,946	$	40,354	$	46,252	$	12,377

	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 June 30, 2015 by contractual maturity (in thousands):

	Amortized Cost		Fair Value
Due in less than one year	$	46,252	$	46,216
Due after one year, through two years	12,377		12,376
Due after two years	—		—
Total short-term and long-term investments	$	58,629	$	58,592