Cash, Cash Equivalents and Investments (Tables)

6 Months Ended

Jun. 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 June 30, 2016 and December 31, 2015 (in thousands):

	As of June 30, 2016
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Cash and Cash Equivalents		Short-Term Investments		Long-Term Investments
Cash	$	35,451	$	—	$	—		$	35,451	$	35,451	$	—	$	—
Level 1:
Money market funds	260		—		—			260		260		—		—
Corporate bonds	34,564		7		(15		)	34,556		765		29,975		3,824
Subtotal	34,824		7		(15		)	34,816		1,025		29,975		3,824
Level 2:
State and municipal obligations	19,201		10		—			19,211		830		17,601		770
Certificates of deposit	2,135		—		—			2,135		—		2,135		—
Subtotal	21,336		10		—			21,346		830		19,736		770
Total	$	91,611	$	17	$	(15	)	$	91,613	$	37,306	$	49,711	$	4,594

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

	Amortized Cost		Fair Value
Due in less than one year	$	49,711	$	49,709
Due after one year, through two years	4,594		4,598
Due after two years	—		—
Total short-term and long-term investments	$	54,305	$	54,307