Quarterly report pursuant to Section 13 or 15(d)

REVENUE RECOGNITION - Narrative (Details)

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REVENUE RECOGNITION - Narrative (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended
Oct. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Sep. 30, 2019
Disaggregation of Revenue [Line Items]        
Revenue from collaboration agreement   $ 544 $ 134  
Proprietary Circuit Designs using XBAR Technology | Murata Manufacturing Co., Ltd.        
Disaggregation of Revenue [Line Items]        
Prepaid royalties       $ 9,000
Written termination period   30 days    
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