Basic and Diluted Net Income (Loss) Per Ordinary Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended		12 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net income (loss) attributable to ordinary shares as reported used in computing basic and diluted net income (loss) per share	$ (13,124)	$ (14,641)	$ (4,128)	$ 9,284	$ 1,655	$ 3,952	$ (31,893)	$ 14,891	$ 19,808
Weighted average number of ordinary shares used in computing basic net income (loss) per share (in shares)	103,731,147			101,234,306			103,281,380	100,601,427	100,930,866
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)	103,731,147			108,643,814			103,281,380	108,113,416	108,877,648
Weighted anti-dilutive shares outstanding which were not included in the diluted calculation (in shares)	8,084,045			952,823			8,827,739	717,492	1,307,762
Basic net income (loss) per ordinary share (in usd per share)	$ (0.13)			$ 0.09			$ (0.31)	$ 0.15	$ 0.20
Diluted net income (loss) per ordinary share (in usd per share)	$ (0.13)			$ 0.09			$ (0.31)	$ 0.14	$ 0.18
Options
Potentially dilutive shares that were excluded from the computation of basic net income (loss) per share:
Share-based payment arrangements (in shares)	0			6,656,439			0	6,688,840	6,967,554
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)	0			738,456			0	808,536	945,612
ESPP
Potentially dilutive shares that were excluded from the computation of basic net income (loss) per share:
Share-based payment arrangements (in shares)	0			14,613			0	14,613	33,616