EQUITY (Tables)

12 Months Ended

Dec. 31, 2015

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, 2013	​	​	​	40,190,595	​	11,913,135	​	4,818,795	​	43,469,535	​	14,047,435	​	—	​	—	​	77,546,385
Exercise of options	​	​	​	—	​	—	​	—	​	—	​	—	​	—	​	—	​	6,229,270
Issuance of F1 shares	​	​	​	—	​	—	​	—	​	—	​	—	​	4,297,995	​	—	​	—
Investment transaction (see note 8(d))	​	​	​	(8,119,760)	​	(5,209,615)	​	(1,428,305)	​	(11,304,580)	​	(2,297,735)	​	10,028,655	​	41,547,280	​	(23,215,940)
Balance, as of December 31, 2013	​	​	​	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	​	4,293,369	​	—	​	—	​	—	​	—	​	—	​	—	​	—	​	—
Balance, as of December 31, 2015	​	218,847,430	​	—	​	—	​	—	​	—	​	—	​	—	​	—	​	—

Schedule of summarizes 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	​	1,930,756	​	1.22	​	1,849,506	​	1.12
3.7	​	6,321,072	​	3.79	​	5,765,162	​	3.82
6.98 – 7.1	​	13,633,209	​	5.07	​	8,348,824	​	5.03
25 – 46.39	​	890,950	​	6.08	​	73,325	​	5.63
55.63 – 59.33	​	4,412,700	​	6.69	​	0	​	—
​	​	27,188,687	​	4.79	​	16,036,817	​	4.15

Schedule of summarizes 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	​	26,782,719	​	5.44	​
Changes during the year:	​		​		​
Granted(2)	​	4,795,450	​	56.28	​
Exercised	​	(4,218,174)	​	2.13	​
Forfeited	​	(171,308)	​	16.65	​
Expired	​	0	​	—	​	​
Options outstanding at end of year	​	27,188,687	​	14.85	​	745,841
Options exercisable at year-end	​	16,036,817	​	5.20	​	594,618

(1)

The aggregate intrinsic value is calculated as the difference between the exercise price of the underlying awards and the closing stock price of  $42.28 of the Company’s ordinary share on December 31, 2015. 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 September 6, 2015 the Company granted the Company’s founders, who are also shareholders, 4,400,000 options, exercisable into the same amount of the Company’s Ordinary shares, at an exercise price of  $57.58 per share, which are subject to graded vesting over three years.

Schedule of RSU activity

​	Number		Weighted average  grant date fair value ($)
Outstanding at beginning of year	​	0	​	—
Changes during the year:	​		​
Granted(1)	​	357,265	​	40.14
Vested	​	(75,195)	​	36.95
Forfeited	​	(889)	​	38.91
Outstanding at end of year	​	281,181	​	41.0

(1)

During the year ended December 31, 2015, 15,000 RSUs were awarded to non-employees.

Schedule of fair value of options granted

​	Year ended December 31,
​	2015	2014	2013
Risk-free interest rate	0.75% – 2.01%​	0.7% – 2.17%​	0.19% – 2.74%​
Expected option term	2.16 – 6.95 years​	3.82 – 7.27 years​	1 – 12.35 years​
Expected price volatility	35% – 53%​	36% – 55%​	42% – 53%​
Dividend yield	0%​	0%​	0%​
Weighted average fair value at the date of grant	$16.05​	$7.28​	$2.22​

Schedule of share-based compensation expenses

​	Year ended December 31,
​	2015		2014		2013
​	U.S. dollars in thousands
Cost of revenues	​	26	​	27	​	16
Research and development, net	​	8,016	​	6,130	​	2,320
Sales and marketing	​	1,277	​	5,201	​	5,861
General and administrative	​	35,650	​	65,495	​	4,934
Total stock-based compensation	​	44,969	​	76,853	​	13,131

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

​	Year ended December 31,
​	2015		2014		2013
​	U.S. dollars in thousands, except per share data
Numerator for basic and diluted net earnings (losses) per share:	​		​		​
Net income (loss)	​	68,450	​	(30,084)	​	19,920
Amount allocated to participating shareholders	​	—	​	—	​	(16,105)
Adjustment as a result of benefit to participating shareholders	​	—	​	—	​	(229,832)
Net income (loss) applicable to ordinary shares for 2015 and 2014 and applicable to Class A ordinary shares for 2013	​	68,450	​	(30,084)	​	(226,017)
Weighted average shares outstanding:	​		​		​
Denominator for basic net earnings per share	​	217,362	​	107,942	​	37,477
Effect of dilutive securities:	​		​		​
Employee stock options and unvested RSUs	​	20,495	​	—	​	—
Denominator for diluted net earnings per share	​	237,857	​	107,942	​	37,477
Basic net earnings (losses) per share	​	0.31	​	(0.28)	​	(6.03)
Diluted net earnings (losses) per share	​	0.29	​	(0.28)	​	(6.03)