INVESTMENTS (Tables)

9 Months Ended

Sep. 30, 2013

INVESTMENTS

Schedule of investments

	Amortized		Unrealized				Market
	Cost		Gain		(Loss)		Value
September 30, 2013
Short-term investments:
Government sponsored enterprises	$	16,871	$	5	$	—	$	16,876
Total	$	16,871	$	5	$	—	$	16,876
December 31, 2012
Short-term investments:
Government sponsored enterprises	$	29,189	$	12	$	—	$	29,201
Long-term investments:
Government-sponsored enterprises	2,507		1		—		2,508
Total	$	31,696	$	13	$	—	$	31,709