BALANCE SHEET DETAILS - Other Assets, Net (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Other Assets, Net [Abstract]
Contract assets - long-term	$ 6,374	$ 6,928
Right-of-use (ROU) assets	2,571	2,202
Deferred tax assets	470	470
Other assets and deposits	6,700	7,062
Total other assets	$ 16,115	$ 16,662