XML 18 R39.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Balance Sheet Components (Components of Inventory) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Balance Sheet Components [Abstract]    
Purchased materials $ 3,966 $ 6,222
Work in process 4,594 7,341
Finished goods 4,752 4,315
Inventory $ 13,312 $ 17,878