Cash, Cash Equivalents and Investments (Tables)

3 Months Ended

Mar. 31, 2016

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, 2016 and December 31, 2015 (in thousands):

	As of March 31, 2016
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Cash and Cash Equivalents		Short-Term Investments		Long-Term Investments
Cash	$	51,485	$	—	$	—		$	51,485	$	51,485	$	—	$	—
Level 1:
Money market funds	1,880		—		—			1,880		1,880		—		—
Corporate bonds	36,878		7		(28		)	36,857		—		29,619		7,259
Subtotal	38,758		7		(28		)	38,737		1,880		29,619		7,259
Level 2:
State and municipal obligations	20,465		11		(2		)	20,474		—		18,060		2,405
Certificates of deposit	3,355		—		—			3,355		—		3,010		345
Subtotal	23,820		11		(2		)	23,829		—		21,070		2,750
Total	$	114,063	$	18	$	(30	)	$	114,051	$	53,365	$	50,689	$	10,009

	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

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, 2016 by contractual maturity (in thousands):

	Amortized Cost		Fair Value
Due in less than one year	$	50,689	$	50,675
Due after one year, through two years	10,009		10,011
Due after two years	—		—
Total short-term and long-term investments	$	60,698	$	60,686