INVESTMENTS (Tables)

12 Months Ended

Dec. 31, 2014

Investments, Debt and Equity Securities [Abstract]

Schedule of Available-for-sale and Trading Securities Reconciliation

The following tables summarize our short-term investments (in thousands):

		As of December 31, 2014
	Maturity (in years)	Amortized cost	Gross unrealized gains	Gross unrealized losses		Estimated fair value
Corporate debt securities (1)	1 year or less	21,208	3	(1	)	21,210
Commercial paper (1)	1 year or less	1,500	—	—		1,500
		22,708	3	(1	)	22,710

		As of December 31, 2013
	Maturity (in years)	Amortized cost	Gross unrealized gains	Gross unrealized losses		Estimated fair value
Government sponsored enterprise (1)	2 years or less	3,001	—	(3	)	2,998
Corporate debt securities (1)	2 years or less	31,319	—	(22	)	31,297
Commercial paper (1)	1 year or less	8,485	12	—		8,497
Guaranteed investment certificates (2)	1 year or less	5,046	—	(3	)	5,043
		47,851	12	(28	)	47,835

(1) Investments are designated as available-for-sale investments.

(2) Investments are designated as trading investments.