Quarterly report pursuant to Section 13 or 15(d)

Balance Sheet Components - Additional Information (Details)

v3.20.2
Balance Sheet Components - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Balance Sheet Components        
Depreciation, Depletion and Amortization $ 15,000 $ 14,000 $ 29,000 $ 28,000