Cash, Cash Equivalents and Investments (Tables)

9 Months Ended

Sep. 30, 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 September 30, 2016 and December 31, 2015 (in thousands):

	As of September 30, 2016
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Cash and Cash Equivalents		Short-Term Investments		Long-Term Investments
Cash	$	45,792	$	—	$	—		$	45,792	$	45,792	$	—	$	—
Level 1:
Money market funds	4,163		—		—			4,163		4,163		—		—
Corporate bonds	36,331		3		(35		)	36,299		645		29,911		5,775
Subtotal	40,494		3		(35		)	40,462		4,808		29,911		5,775
Level 2:
State and municipal obligations	15,152		1		(8		)	15,145		—		14,667		485
Certificates of deposit	1,042		—		—			1,042		—		1,042
Subtotal	16,194		1		(8		)	16,187		—		15,709		485
Total	$	102,480	$	4	$	(43	)	$	102,441	$	50,600	$	45,620	$	6,260

	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 September 30, 2016 by contractual maturity (in thousands):

	Amortized Cost		Fair Value
Due in less than one year	$	45,620	$	45,581
Due after one year, through two years	6,260		6,260
Due after two years	—		—
Total short-term and long-term investments	$	51,880	$	51,841