Share Capital - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands			1 Months Ended		12 Months Ended
	Dec. 31, 2017	Oct. 07, 2015	Jan. 31, 2016	Jun. 30, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 30, 2017
Share Capital [Line Items]
Voting rights of ordinary shareholder					one
Number of warrants cashless exercised					1,418,711	902,132
Warrants exercise price	$ 3.59				$ 3.59	$ 3.59
Credit facility repayment date					Dec. 31, 2013
Class of Warrant or Right, Date from which Warrants or Rights Exercisable					Jan. 31, 2016
Unrecognized compensation cost	$ 39,253				$ 39,253
Unrecognized compensation cost expected recognition weighted average period					2 years 10 months 10 days
Weighted average grant date fair values options granted					$ 10.53	7.37	$ 10.64
Weighted average grant date fair values options forfeited and cancelled					$ 12.54	$ 9.72	$ 5.73
Aggregate intrinsic values options exercised					$ 17,945	$ 7,673	$ 3,546
Fair value of ordinary shares	$ 20.20				$ 20.20	$ 7.85	$ 22.36
Options
Share Capital [Line Items]
Stock awards granted, vesting period					4 years
Stock awards granted, expiration period					10 years
2015 Plan
Share Capital [Line Items]
Percentage increase in number of shares available for issuance	4.00%
Number of shares available for issuance	23,302,529				23,302,529			19,730,105
Ordinary shares available for grant	12,971,921				12,971,921
2015 Plan | Options
Share Capital [Line Items]
Stock awards granted, vesting period					4 years
Stock awards granted, expiration period					10 years
2015 Plan | RSUs
Share Capital [Line Items]
Stock awards granted, vesting period					3 years
ESPP
Share Capital [Line Items]
Ordinary shares available for grant	2,277,705				2,277,705
Increase in shares authorized for issuance available for grants	830,000				830,000
Percentage of increase in shares outstanding					1.00%
Ordinary Shares
Share Capital [Line Items]
Warrants exercised to ordinary shares							62,744,517
Issuance of shares in connection with employee stock purchase plan(in shares)					167,433	92,388
Ordinary Shares | IPO
Share Capital [Line Items]
Sale of ordinary shares		7,876,195
Proceeds from issuance of ordinary shares		$ 157,534
Ordinary Shares | ESPP
Share Capital [Line Items]
Issuance of shares in connection with employee stock purchase plan(in shares)					259,821
Warrant
Share Capital [Line Items]
The Number of ordinary shares that originally could be purchased by exercise of warrants in cash					6,498	220,316
Warrants exercised to ordinary shares			315,155
Warrant | Warrants Not Settleable in Cash
Share Capital [Line Items]
Sale of ordinary shares					803,138	864,341
Series J Convertible Preferred shares
Share Capital [Line Items]
Shares issued				4,068,500
Shares issued, price per share				$ 23.33
Proceeds from issuance of preferred shares, net				$ 94,599
Share issuance expenses				$ 319
Liquidation preference per share				$ 23.33
Series H Convertible Preferred Shares
Share Capital [Line Items]
Warrants exercise price	$ 18.77				$ 18.77
Warrants issued to purchase of preferred shares					975,644