Quarterly report pursuant to Section 13 or 15(d)

Balance Sheet Components - Additional Information (Details)

v3.19.2
Balance Sheet Components - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Balance Sheet Components        
Depreciation, Depletion and Amortization $ 14 $ 9 $ 28 $ 19