Cash, Cash Equivalents and Investments (Tables)

12 Months Ended

Dec. 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 December 31 (in thousands):

	As of December 31, 2015
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Cash and Cash Equivalents		Short-Term Investments		Long-Term Investments
Cash	$	57,137	$	—	$	—		$	57,137	$	57,137	$	—	$	—
Level 1:
Money market funds	2,389		—		—			2,389		2,389		—		—
Corporate bonds	36,406		—		(70		)	36,336		—		35,677		729
Subtotal	38,795		—		(70		)	38,725		2,389		35,677		729
Level 2:
State and municipal obligations	19,002		11		(9		)	19,004		—		12,000		7,002
Certificates of deposit	3,371		—		—			3,371		—		2,577		794
Subtotal	22,373		11		(9		)	22,375		—		14,577		7,796
Total	$	118,305	$	11	$	(79	)	$	118,237	$	59,526	$	50,254	$	8,525

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

	Amortized Cost		Fair Value
Due in less than one year	$	50,254	$	50,190
Due after one year, through two years	8,525		8,521
Due after two years	—		—
Total short-term and long-term investments	$	58,779	$	58,711