Marketable Securities (Tables)

6 Months Ended

Dec. 31, 2015

Marketable Securities

Summary of the fair value, the amortized cost and unrealized holding gains (losses) on marketable securities

	Fair Value		Cost		Unrealized Gains		Unrealized Losses
	(Dollars in Thousands)
December 31, 2015:
U.S. corporate bonds	$	29,946	$	29,967	$	1	$	(22	)
Total short-term marketable securities	$	29,946	$	29,967	$	1	$	(22	)
U.S. corporate bonds	$	—	$	—	$	—	$	—
Total long-term marketable securities	$	—	$	—	$	—	$	—
June 30, 2015:
U.S. corporate bonds	$	59,197	$	59,223	$	8	$	(34	)
Total short-term marketable securities	$	59,197	$	59,223	$	8	$	(34	)
U.S. corporate bonds	$	3,047	$	3,055	$	—	$	(8	)
Total long-term marketable securities	$	3,047	$	3,055	$	—	$	(8	)