Basic and Diluted Net Income (Loss) Per Ordinary Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net income (loss)	$ (4,128)	$ 3,952	$ 19,808
Net income (loss) used in computing basic net income (loss) per share	(4,128)	3,952	19,808
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	$ (4,128)	$ 3,952	$ 19,808
Weighted average number of ordinary shares used in computing basic net income (loss) per share (in shares)	102,633,545	99,877,567	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)	102,633,545	108,100,623	108,877,648
Weighted anti-dilutive shares outstanding which were not included in the diluted calculation (in shares)	9,734,269	352,291	1,307,762
Basic net income (loss) per ordinary share (in usd per share)	$ (0.04)	$ 0.04	$ 0.20
Diluted net income (loss) per ordinary share (in usd per share)	$ (0.04)	$ 0.04	$ 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	7,113,992	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	1,094,385	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	14,679	33,616