Investments (Tables)

9 Months Ended

Sep. 30, 2014

Investments Debt And Equity Securities [Abstract]

Short-Term and Long-Term Investments in Debt Securities

In addition, the Company has short-term and long-term investments in debt securities which are summarized as follows (in thousands):

	Cost Basis		Unrealized Gains		Unrealized Losses			Fair Value
Balances at September 30, 2014:
Investments-Short-term:
U.S. government securities	$	28,888	$	23	$	—		$	28,911
U.S. government agency securities		39,246		19		(1	)		39,264
Non-U.S. government securities		6,804		4		—			6,808
Corporate debt securities		76,088		21		(23	)		76,086
Total investments - short-term	$	151,026	$	67	$	(24	)	$	151,069
Investments-Long-term:
U.S. government securities	$	28,544	$	14	$	(2	)	$	28,556
U.S. government agency securities		30,664		5		(28	)		30,641
Non-U.S. government securities		—		—		—			—
Corporate debt securities		26,422		4		(24	)		26,402
Total investments - long-term	$	85,630	$	23	$	(54	)	$	85,599
Balances at December 31, 2013:
Investments-Short-term:
U.S. government securities	$	19,792	$	9	$	—		$	19,801
U.S. government agency securities		38,388		16		(3	)		38,401
Non-U.S. government securities		13,734		10		—			13,744
Corporate debt securities		62,720		22		(4	)		62,738
Total investments - short-term	$	134,634	$	57	$	(7	)	$	134,684
Investments-Long-term:
U.S. government securities	$	12,252	$	8	$	—		$	12,260
U.S. government agency securities		30,627		12		(3	)		30,636
Non-U.S. government securities		2,305		4		—			2,309
Corporate debt securities		11,152		15		—			11,167
Total investments - long-term	$	56,336	$	39	$	(3	)	$	56,372

Schedule of Investment in Unrealized Loss Position

The following table summarizes the fair value and gross unrealized losses of the Company’s investments, including those that are categorized as cash equivalents, with unrealized losses aggregated by type of investment instrument and length of time that individual securities have been in a continuous unrealized loss position as of September 30, 2014 and December 31, 2013 (in thousands):

	Less than 12 Months					12 Months or Greater					Total
	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
September 30, 2014:
U.S. government securities	$	5,478	$	(2	)	$	—	$	—		$	5,478	$	(2	)
U.S. government agency securities		19,964		(29	)		—		—			19,964		(29	)
Corporate debt securities		54,662		(47	)		—		—			54,662		(47	)
Total investments	$	80,104	$	(78	)	$	—	$	—		$	80,104	$	(78	)
December 31, 2013:
U.S. government agency securities	$	5,533	$	(6	)	$	—	$	—		$	5,533	$	(6	)
Corporate debt securities		9,837		(3	)		1,504		(1	)		11,341		(4	)
Total investments	$	15,370	$	(9	)	$	1,504	$	(1	)	$	16,874	$	(10	)