BALANCE SHEET DETAILS - Other Assets, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Other Assets, Net [Abstract]
Contract assets - long-term	$ 1,746	$ 4,596
Lease right-of-use assets	912	1,607
Deferred tax assets	2,115	2,659
Debt Securities, Available-for-sale, Noncurrent	7,286	0
Other assets	36	138
Total other assets, net	$ 12,095	$ 9,000