Net Loss Per Share - Net (Loss) Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Numerator:
Net loss used in calculating net loss per share, basic	$ (31,644)	$ (47,276)	$ (56,660)	$ (62,418)
Denominator:
Weighted average shares of common stock outstanding used in computing net (loss) income per share, basic (in shares)	19,858	18,700	19,819	18,392
Dilutive effect of incremental shares and share equivalents:
Weighted average shares of common stock outstanding used in computing net (loss) income per share, diluted (in shares)	19,858	18,700	19,819	18,392
Net loss per share:
Net (loss) income per share, basic (USD per share)	$ (1.59)	$ (2.53)	$ (2.86)	$ (3.39)
Net (loss) income per share, diluted (USD per share)	$ (1.59)	$ (2.53)	$ (2.86)	$ (3.39)
Convertible notes
Dilutive effect of incremental shares and share equivalents:
Dilutive effect of share-based payment arrangements (in shares)	0	0	0	0
Options
Dilutive effect of incremental shares and share equivalents:
Dilutive effect of share-based payment arrangements (in shares)	0	0	0	0
RSUs
Dilutive effect of incremental shares and share equivalents:
Dilutive effect of share-based payment arrangements (in shares)	0	0	0	0
PSUs
Dilutive effect of incremental shares and share equivalents:
Dilutive effect of share-based payment arrangements (in shares)	0	0	0	0
ESPP
Dilutive effect of incremental shares and share equivalents:
Dilutive effect of share-based payment arrangements (in shares)	0	0	0	0