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Organization and Summary of Significant Accounting Policies - Net Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Numerator:
Net loss and comprehensive loss	$ (5,775)	$ (2,781)	$ (2,202)	$ (1,436)	$ (8,556)	$ (3,638)
Accretion of redeemable convertible preferred stock to redemption value	9	13
Net loss and comprehensive loss available to common stockholders	$ (5,784)		$ (2,202)		$ (8,578)	$ (3,638)
Denominator:
Weighted-average common stock outstanding, basic and diluted	243,076		241,467		243,076	241,467
Net loss per share, basic and diluted	$ (23.80)		$ (9.12)		$ (35.29)	$ (15.07)
Series A redeemable convertible preferred stock
Numerator:
Accretion of redeemable convertible preferred stock to redemption value	$ (9)	$ (13)			$ (22)

X

- 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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