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Net Loss per Share Attributable to Common Stockholders - Schedule of Basic and Diluted Net Loss per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Numerator:
Net loss attributable to common stockholders	$ (9,255)	$ (5,869)	$ (18,394)	$ (11,554)
Denominator:
Weighted-average shares outstanding	31,731,628	6,597,811	31,538,329	4,854,125
Less: weighted-average shares subject to repurchase	0	(804)	0	(800)
Weighted-average shares outstanding used in computing net loss per share attributable to common stockholders—basic and diluted	31,731,628	6,597,007	31,538,329	4,853,325
Net loss per share, basic and diluted	$ (0.29)	$ (0.89)	$ (0.58)	$ (2.38)

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- Definition

The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.

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