Basic and Diluted Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net income (loss) attributable to ordinary shares as reported	$ 4,917	$ 9,284	$ 1,655	$ 3,952	$ 4,260	$ 1,930	$ (1,270)	$ (12,150)	$ (15,631)	$ (11,694)	$ (15,510)	$ (20,724)	$ 19,808	$ (7,230)	$ (63,559)
Net income (loss) used in computing basic net income (loss) per share													19,808	(7,230)	(63,559)
Adjustment needed in calculating diluted net income (loss) per share													0	0	0
Net income (loss) used in computing diluted net income (loss) per share													$ 19,808	$ (7,230)	$ (63,559)
Weighted average number of ordinary shares used in computing basic net income (loss) per share (in shares)	101,945,085	101,234,306	100,718,893	99,877,567	99,226,445	98,485,519	96,356,317	94,811,282					100,930,866	97,237,549	91,828,043
Potentially dilutive shares that were excluded from the computation of basic net income (loss) per share:
Weighted average number of ordinary shares used in computing diluted net income (loss) per share (in shares)	110,604,714	108,643,814	107,647,802	108,100,623	107,911,519	107,604,578	96,356,317	94,811,282					108,877,648	97,237,549	91,828,043
Weighted anti-dilutive shares outstanding which were not included in the diluted calculation (in shares)													1,307,762	10,230,982	9,341,735
Basic net income (loss) per ordinary share (in usd per share)	$ 0.05	$ 0.09	$ 0.02	$ 0.04	$ 0.04	$ 0.02	$ (0.01)	$ (0.13)					$ 0.20	$ (0.07)	$ (0.69)
Diluted net income (loss) per ordinary share (in usd per share)	$ 0.04	$ 0.09	$ 0.02	$ 0.04	$ 0.04	$ 0.02	$ (0.01)	$ (0.13)					$ 0.18	$ (0.07)	$ (0.69)
Options
Potentially dilutive shares that were excluded from the computation of basic net income (loss) per share:
Share-based payment arrangements (in shares)													6,967,554	0	0
Restricted share units
Potentially dilutive shares that were excluded from the computation of basic net income (loss) per share:
Share-based payment arrangements (in shares)													945,612	0	0
ESPP
Potentially dilutive shares that were excluded from the computation of basic net income (loss) per share:
Share-based payment arrangements (in shares)													33,616	0	0