Cash, cash equivalents, and investments (Tables)

6 Months Ended

Jun. 30, 2014

Cash And Cash Equivalents [Abstract]

Summary of Cash, Cash Equivalents and Held-to-Maturity Investments by Type

The following is a summary of cash, cash equivalents and held-to-maturity investments by type at June 30, 2014 and December 31, 2013 (in thousands):

	June 30, 2014									December 31, 2013
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Cash and money market funds	$	25,023	$	—	$	—		$	25,023	$	42,226	$	—	$	—		$	42,226
State and municipal obligations		17,419		26		—			17,445		10,807		14		—			10,821
Corporate bonds		14,692		4		(12	)		14,684		7,743		2		(14	)		7,731
Certificates of deposit		2,617		—		—			2,617		2,619		—		—			2,619
Total cash, cash equivalents and investments	$	59,751	$	30	$	(12	)	$	59,769	$	63,395	$	16	$	(14	)	$	63,397

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, 2014 by contractual maturity (in thousands):

	Amortized Cost		Fair Value
Due in less than one year	$	22,890	$	22,903
Due after one year, through two years		10,918		10,923
Total short-term and long-term investments	$	33,808	$	33,826

Schedule of Company's Investments Measured at Fair Value

The following table presents information about the Company’s investments that are measured at fair value as of June 30, 2014, and indicates the fair value hierarchy of the valuation (in thousands):

	Amortized Cost		Quoted Prices in Active Markets for Identical Assets (Level 1)		Siginificant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total Fair Value
Cash	$	23,099	$	23,099	$	—	$	—	$	23,099
Money market funds		1,924		1,924		—		—		1,924
Certificates of deposit		2,617		—		2,617		—		2,617
Corporate bonds		14,692		14,692		—		—		14,684
State and municipal obligations		17,419		—		17,419		—		17,445
Total cash, cash equivalents and investments	$	59,751	$	39,715	$	20,036	$	—	$	59,769