XML 82 R57.htm IDEA: XBRL DOCUMENT v3.21.2
Other Balance Sheet Components - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Other Balance Sheet Components [Abstract]          
Restricted Cash $ 0   $ 0   $ 0
Depreciation expense $ 15,700,000 $ 9,700,000 $ 30,200,000 $ 18,700,000