Net Income (Loss) Per Share - Net Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Numerator:
Net income (loss)	$ 2,062	$ (23,877)	$ (12,348)
Denominator:
Weighted average shares of common stock outstanding used in computing net income (loss) per share, basic (in shares)	17,891	16,691	14,096
Dilutive effect of incremental shares and share equivalents:
Weighted average shares of common stock outstanding used in computing net loss per share, diluted (in shares)	18,362	16,691	14,096
Net income (loss) per share:
Net income (loss) per share, basic (USD per share)	$ 0.12	$ (1.43)	$ (0.88)
Net income (loss) per share, diluted (USD per share)	$ 0.11	$ (1.43)	$ (0.88)
Options
Dilutive effect of incremental shares and share equivalents:
Dilutive effect of share-based payment arrangements (in shares)	68	0	0
RSUs
Dilutive effect of incremental shares and share equivalents:
Dilutive effect of share-based payment arrangements (in shares)	294	0	0
PSUs
Dilutive effect of incremental shares and share equivalents:
Dilutive effect of share-based payment arrangements (in shares)	104	0	0
ESPP
Dilutive effect of incremental shares and share equivalents:
Dilutive effect of share-based payment arrangements (in shares)	5	0	0