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REVENUE RECOGNITION - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Disaggregation of Revenue [Line Items]        
Revenue from Collaboration agreement $ 79 $ 115 $ 276 $ 396
Proprietary Circuit Designs using XBAR Technology | Murata Manufacturing Co., Ltd.        
Disaggregation of Revenue [Line Items]        
Prepaid royalties $ 9,000   $ 9,000  
Contracted exclusivity period     30 months  
Accounts Receivable | Proprietary Circuit Designs using XBAR Technology | Murata Manufacturing Co., Ltd.        
Disaggregation of Revenue [Line Items]        
Revenue from Collaboration agreement     $ 2,000