EQUITY (Tables)

12 Months Ended

Dec. 31, 2016

Stockholders' Equity Note [Abstract]

Schedule of summary of equity activity

​	Ordinary  Shares		Class A  Ordinary  Shares		Class B  Ordinary  Shares		Class C  Ordinary  Shares		Class D  Ordinary  Shares		Class E  Ordinary  Shares		Class F1  Ordinary  Shares		Class F2  Ordinary  Shares		Ordinary  Shares (with  liquidation  preference)
​	Number of shares – issued and outstanding
Balance, as of January 1, 2014	​	​	​	32,070,835	​	6,703,520	​	3,390,490	​	32,164,955	​	11,749,700	​	14,326,650	​	41,547,280	​	60,559,715
Exercise of options – prior to IPO	​	—	​	—	​	—	​	—	​	—	​	—	​	—	​	—	​	1,463,051
Conversion upon IPO closing	​	203,976,196	​	(32,070,835)	​	(6,703,520)	​	(3,390,490)	​	(32,164,955)	​	(11,749,700)	​	(14,326,650)	​	(41,547,280)	​	(62,022,766)
IPO	​	8,325,000	​	—	​	—	​	—	​	—	​	—	​	—	​	—	​	—
Exercise of options – commencing IPO	​	2,252,865	​	—	​	—	​	—	​	—	​	—	​	—	​	—	​	—
Balance, as of December 31, 2014	​	214,554,061	​	—	​	—	​	—	​	—	​	—	​	—	​	—	​	—
Exercise of options and vesting of RSUs	​	4,293,369	​	—	​	—	​	—	​	—	​	—	​	—	​	—	​	—
Balance, as of December 31, 2015	​	218,847,430	​	—	​	—	​	—	​	—	​	—	​	—	​	—	​	—
Exercise of options and vesting of RSUs	​	2,890,584	​	—	​	—	​	—	​	—	​	—	​	—	​	—	​	—
Balance, as of December 31, 2016	​	221,738,014	​	​	​	​	​	​	​	​	​	​	​	​	​	​	​	​

Schedule of information regarding outstanding and exercisable options

Exercise price	Outstanding				Exercisable
(US $)	Number		Weighted average remaining contractual life (in years)		Number		Weighted average remaining contractual life (in years)
0.096 – 2.991		119,655		3.35		84,655		3.48
3.7		5,882,283		2.84		5,734,118		2.85
6.98		13,146,059		4.06		12,227,784		4.03
25 – 46.88		5,384,240		6.35		238,356		5.06
55.63 – 59.33		4,410,700		5.68		1,470,350		5.68
		28,942,937		4.48		19,755,263		3.82

Schedule of options granted to employees, directors and service providers

	Number		Weighted average exercise price		Aggregated intrinsic value(1)
			$		U.S. dollars in thousands
Options outstanding at beginning of year		27,188,687		14.85
Changes during the year:
Granted(2)		4,576,500		45.91
Exercised		(2,746,100)		2.88
Forfeited		(76,150)		18.90
Options outstanding at end of year		28,942,937		20.82		623,550
Options exercisable at year-end		19,755,263		10.05		583,398

(1)    The aggregate intrinsic value is calculated as the difference between the exercise price of the underlying awards and the closing stock price of  $38.12 of the Company’s ordinary share on December 31, 2016. This represents the potential pre-tax amount receivable by the option holders had all option holders exercised their options as of such date.

(2)    On August 15, 2016 the Company granted the Company’s founders, who are also shareholders, 4,000,000 options, exercisable into the same amount of the Company’s ordinary shares, at an exercise price of  $46.88 per share, which are subject to graded vesting over four years.

Schedule of RSUs activity

	Number		Weighted average grant date fair value ($)
Outstanding at beginning of year		281,181		41.0
Changes during the year:
Granted		205,962		38.96
Vested		(144,484)		40.33
Forfeited		(16,372)		41.07
Outstanding at end of year		326,287		40.01

Schedule of assumptions used for the estimation of the fair value of options granted using the Black-Scholes option pricing model

	Year ended December 31,
	2016	2015	2014
Risk-free interest rate	0.93% – 1.57%	0.75% – 2.01%	0.7% – 2.17%
Expected option term	3.28 – 6.67 years	2.16 – 6.95 years	3.82 – 7.27 years
Expected price volatility	40% – 44%	35% – 53%	36% – 55%
Dividend yield	0%	0%	0%
Weighted average fair value at the date of grant	$17.09	$16.05	$7.28

Schedule of share-based compensation expenses

	Year ended December 31,
	2016		2015		2014
	U.S. dollars in thousands
Cost of revenues		46		26		27
Research and development, net		12,216		8,016		6,130
Sales and marketing		706		1,277		5,201
General and administrative		52,634		35,650		65,495
Total stock-based compensation		65,602		44,969		76,853

Schedule of computation of basic and diluted net earnings (losses) per share

	Year ended December 31,
	2016		2015		2014
	U.S. dollars in thousands, except per share data
Numerator for basic and diluted net earnings (losses) per share:
Net income (loss) applicable to ordinary shares		108,370		68,450		(30,084)
Weighted average shares outstanding:
Denominator for basic net earnings per share		220,124		217,362		107,942
Effect of dilutive securities:
Employee and Non-Employee stock options and unvested RSUs		17,894		20,495		—
Denominator for diluted net earnings per share		238,018		237,857		107,942
Basic net earnings (losses) per share		0.49		0.31		(0.28)
Diluted net earnings (losses) per share		0.46		0.29		(0.28)