Short-term Investments

9 Months Ended

Sep. 30, 2013

Investments Debt And Equity Securities [Abstract]

Short-term Investments

4. Short-term Investments

The amortized cost and estimated fair values of short-term investments are summarized in the following table (in thousands):

	SEPTEMBER 30, 2013
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Securities Held-to-Maturity
Certificates of deposit, with maturities less than 1 year	$	12,684	$	1	$	(5)	$	12,680

The short-term investments at September 30, 2013 were in inactive markets and, therefore, the estimated fair value is measured based on the Level 2 valuation hierarchy. The Company did not have any investments in securities as of December 31, 2012.