CONCENTRATION OF RISK, Revenues by Geographic Area (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended												12 Months Ended
	Dec. 31, 2014		Sep. 30, 2014	Jun. 30, 2014		Mar. 31, 2014	Dec. 31, 2013		Sep. 30, 2013	Jun. 30, 2013		Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Concentration Risk [Line Items]
Revenues	$ 56,173	[1]	$ 32,892	$ 64,127	[1]	$ 37,839	$ 49,478	[1],[2]	$ 32,826	$ 49,359	[1]	$ 14,976	$ 191,031	$ 146,639	$ 83,244
UNITED STATES
Concentration Risk [Line Items]
Revenues													706	1,552	3,893
South Korea [Member]
Concentration Risk [Line Items]
Revenues													141,922	102,948	61,960
Japan [Member]
Concentration Risk [Line Items]
Revenues													44,903	40,539	13,666
Taiwan [Member]
Concentration Risk [Line Items]
Revenues													1,596	904	3,074
Other [Member]
Concentration Risk [Line Items]
Revenues													1,904	696	651
All Countries [Domain]
Concentration Risk [Line Items]
Revenues													$ 190,325	$ 145,087	$ 79,351

[1] (1) The Company receives significant license revenue in the second and fourth quarters; see Note 2 for further details.

[2] Includes $1.5 million of revenue that was recognized relating to cash payments received in a prior year that were creditable against license fees and/or royalties for which the Company determined there was no appreciable likelihood of executing a commercial license agreement with the customer (see Note 2).