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Net Loss Per Share - Summary of Basis in Diluted Net Loss Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Numerator:
Net loss	$ (7,058)	$ (5,229)	$ (12,413)	$ (9,457)
Denominator:
Weighted-average common shares outstanding	937,300	519,112	733,679	517,825
Less: Weighted-average unvested restricted shares and shares subject to repurchase	(11,868)	(61,114)	(16,061)	(73,359)
Weighted-average shares used to computing basic and diluted net loss per share	925,432	457,998	717,618	444,466
Net loss per share attributable to common stockholders - basic and diluted	$ (7.63)	$ (11.42)	$ (17.30)	$ (21.28)

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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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