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Acquisitions - Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Sep. 14, 2018
May 09, 2018
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]        
Goodwill $ 38,640 $ 38,640    
Echelon Corporation [Member]        
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]        
Cash     $ 15,270  
Short term investments     1,274  
Accounts receivable     3,020  
Inventories     5,710  
Other current assets     2,845  
Property and equipment, net     614  
Intangible assets     17,690  
Goodwill     4,266  
Other non-current assets     252  
Accounts payable     (3,630)  
Other current liabilities     (2,642)  
Other non-current liabilities     (563)  
Fair value of net assets acquired     $ 44,106  
S3 Asic Semiconductors Limited [Member]        
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]        
Cash       $ 267
Accounts receivable       192
Other current assets       883
Property and equipment, net       191
Intangible assets       15,340
Goodwill       34,352
Accounts payable       (37)
Deferred revenue       (129)
Earn-out liability, current       (10,218)
Other current liabilities       (761)
Deferred tax liability       (1,918)
Earn-out liability, non-current       (3,279)
Fair value of net assets acquired       $ 34,883