Cash, Cash Equivalents and Investments (Tables)

3 Months Ended

Mar. 31, 2017

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, 2017 and December 31, 2016 (in thousands):

	As of March 31, 2017
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Cash and Cash Equivalents		Short-Term Investments		Long-Term Investments
Cash	$	22,879	$	—	$	—		$	22,879	$	22,879	$	—	$	—
Level 1:
Money market funds	19,095		—		—			19,095		19,095		—		—
Corporate bonds	22,893		—		(26		)	22,867		—		22,893		—
Subtotal	41,988		—		(26		)	41,962		19,095		22,893		—
Level 2:
State and municipal obligations	6,392		—		(1		)	6,391		—		6,392		—
Certificates of deposit	345		—		—			345		—		345		—
Subtotal	6,737		—		(1		)	6,736		—		6,737		—
Total	$	71,604	$	—	$	(27	)	$	71,577	$	41,974	$	29,630	$	—

	As of December 31, 2016
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Cash and Cash Equivalents		Short-Term Investments		Long-Term Investments
Cash	$	32,802	$	—	$	—		$	32,802	$	32,802	$	—	$	—
Level 1:
Money market funds	7,849		—		—			7,849		7,849		—		—
Corporate bonds	33,379		—		(57		)	33,322		—		33,379		—
Subtotal	41,228		—		(57		)	41,171		7,849		33,379		—
Level 2:
State and municipal obligations	14,477		—		(10		)	14,467		—		14,243		234
Certificates of deposit	793		—		—			793		—		793		—
Subtotal	15,270		—		(10		)	15,260		—		15,036		234
Total	$	89,300	$	—	$	(67	)	$	89,233	$	40,651	$	48,415	$	234

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, 2017 by contractual maturity (in thousands):

	Amortized Cost		Fair Value
Due in less than one year	$	29,630	$	29,603
Due after one year, through two years	—		—
Due after two years	—		—
Total short-term and long-term investments	$	29,630	$	29,603