Marketable Securities, Available-for-sale (Tables)

6 Months Ended

Jun. 30, 2015

Investments, Debt and Equity Securities [Abstract]

Fair value of the available-for-sale marketable securities, by type of security

The following table displays the fair values of marketable securities, available-for-sale, by type of security:

	JUNE 30, 2015
(in thousands)	AMORTIZED COST		GROSS UNREALIZED GAINS		ESTIMATED FAIR VALUE
Type of security:
U.S. Treasury securities	$	450	$	—	$	450
Municipal debt securities	9,766		49		9,815
Total debt securities	10,216		49		10,265
Time deposits	7,526		—		7,526
Total marketable securities, available-for-sale	$	17,742	$	49	$	17,791
	DECEMBER 31, 2014
Type of security:
U.S. Treasury securities	$	350	$	—	$	350
Municipal debt securities	9,766		218		9,984
Total debt securities	10,116		218		10,334
Time deposits	7,511		—		7,511
Total marketable securities, available-for-sale	$	17,627	$	218	$	17,845

Fair value of the available-for-sale marketable securities, by contractual maturity

The following table displays the fair values of marketable securities, available-for-sale, by contractual maturity:

(in thousands)	JUNE 30, 2015		DECEMBER 31, 2014
Contractual maturity:
Maturing in one year or less	$	7,976	$	7,861
Maturing after three years	9,815		9,984
Total marketable securities, available-for-sale	$	17,791	$	17,845