SUPPLEMENTARY QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
SUPPLEMENTARY QUARTERLY FINANCIAL DATA (UNAUDITED)
Total revenue	$ 58,267	$ 54,922	$ 50,680	$ 46,000	$ 42,345	$ 39,287	$ 36,030	$ 32,292	$ 209,869	$ 149,954	$ 95,918
Total gross profit	39,170	36,261	32,733	29,589	28,261	26,062	23,614	21,216	137,753	99,153	57,939
Net loss	(16,039)	(16,975)	(17,453)	(18,612)	(16,155)	(13,009)	(13,271)	(12,520)	(69,079)	(54,955)	(47,360)
Net loss and adjustment attributable to redeemable non-controlling interests (Note 3)	(1,112)	(1,263)	(497)	454	242	206	159	11	(2,418)	618
Net loss attributable to Marketo	$ (17,151)	$ (18,238)	$ (17,950)	$ (18,158)	$ (15,913)	$ (12,803)	$ (13,112)	$ (12,509)	$ (71,497)	$ (54,337)	$ (47,360)
Net loss per share of common stock, basic and diluted (in dollars per share)	$ (0.40)	$ (0.43)	$ (0.43)	$ (0.44)	$ (0.39)	$ (0.31)	$ (0.33)	$ (0.32)	$ (1.68)	$ (1.35)	$ (1.92)