Available for Sale Securities (Tables)

3 Months Ended

Mar. 31, 2014

Investments, Debt and Equity Securities [Abstract]

Schedule of available-for-sale securities reconciliation

The amortized cost and fair values of available for sale securities held as of March 31, 2014 and December 31, 2013 are as follows:

	March 31, 2014
	Amortized cost		Gross unrealized gains		Gross unrealized losses			Fair value
U.S. Treasury securities and obligations of U.S. government authorities and agencies	$	11,014	$	145	$	(57	)	$	11,102
Corporate securities	6,325		79		(15		)	6,389
Certificates of deposit	100		—		—			100
Asset-backed securities	69		2		—			71
	$	17,508	$	226	$	(72	)	$	17,662

	December 31, 2013
	Amortized cost		Gross unrealized gains		Gross unrealized losses			Fair value
U.S. Treasury securities and obligations of U.S. government authorities and agencies	$	11,965	$	140	$	(116	)	$	11,989
Corporate securities	5,567		71		(42		)	5,596
Certificates of deposit	100		—		—			100
Asset-backed securities	76		2		—			78
	$	17,708	$	213	$	(158	)	$	17,763

Schedule of available-for-sale securities, continuous unrealized loss position

The following table summarizes the gross unrealized losses on available for sale securities in an unrealized loss position as of March 31, 2014 and December 31, 2013:

	March 31, 2014
	Less Than or Equal to One Year					More Than One Year
	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
U.S. Treasury securities and obligations of U.S. government authorities and agencies	$	3,408	$	(34	)	$	1,155	$	(23	)
Corporate securities	1,750		(15		)	147		—
Asset-backed securities	—		—			2		—
Total	$	5,158	$	(49	)	$	1,304	$	(23	)

	December 31, 2013
	Less Than or Equal to One Year					More Than One Year
	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
U.S. Treasury securities and obligations of U.S. government authorities and agencies	$	5,543	$	(102	)	$	854	$	(14	)
Corporate securities	2,253		(42		)	67		—
Asset-backed securities	—		—			2		—
Total	$	7,796	$	(144	)	$	923	$	(14	)

Schedule of amortized cost and fair value by contractual maturity date

Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.

	Amortized Cost		Fair Value
Due in one year or less	$	1,113	$	1,121
Due after one year through five years	10,814		10,877
Due after five years through ten years	4,935		5,003
Due after ten years through twenty years	577		590
Asset-backed securities	69		71
	$	17,508	$	17,662