Cash, Cash Equivalents and Investments (Tables)

3 Months Ended

Mar. 31, 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 March 31, 2015 and December 31, 2014 (in thousands):

	As of March 31, 2015
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Cash and Cash Equivalents		Short-Term Investments		Long-Term Investments
Cash	$	44,113	$	—	$	—		$	44,113	$	44,113	$	—	$	—
Level 1:
Money market funds	2,054		—		—			2,054		2,054		—		—
Corporate bonds	36,548		—		(54		)	36,494		—		26,162		10,386
Subtotal	38,602		—		(54		)	38,548		2,054		26,162		10,386
Level 2:
State and municipal obligations	19,108		13		—			19,121		681		15,580		2,847
Certificates of deposit	2,950		—		—			2,950		—		1,470		1,480
Subtotal	22,058		13		—			22,071		681		17,050		4,327
Total	$	104,773	$	13	$	(54	)	$	104,732	$	46,848	$	43,212	$	14,713

	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 March 31, 2015 by contractual maturity (in thousands):

	Amortized Cost		Fair Value
Due in less than one year	$	43,212	$	43,190
Due after one year, through two years	14,713		14,694
Due after two years	—		—
Total short-term and long-term investments	$	57,925	$	57,884