Quarterly report pursuant to Section 13 or 15(d)

REVENUE RECOGNITION - Narrative (Details)

v3.21.2
REVENUE RECOGNITION - Narrative (Details)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
installment
specific_radio_frequency
Sep. 30, 2019
USD ($)
specific_radio_frequency
Sep. 30, 2020
USD ($)
Oct. 31, 2019
USD ($)
Sep. 30, 2021
USD ($)
installment
specific_radio_frequency
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
installment
specific_radio_frequency
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Disaggregation of Revenue [Line Items]                    
Revenue from collaboration agreement         $ 425 $ 1,405 $ 1,647 $ 2,553    
Contract liability $ 4,446   $ 2,378   4,446 2,378 $ 4,446 2,378 $ 1,783 $ 1,731
Minimum                    
Disaggregation of Revenue [Line Items]                    
Contracted exclusivity period             2 years      
Proprietary Circuit Designs using XBAR Technology | Murata Manufacturing Co., Ltd.                    
Disaggregation of Revenue [Line Items]                    
Number of licensed specific radio frequencies | specific_radio_frequency   4                
Prepaid royalties   $ 9,000                
Written termination period 30 days 30 days                
Contracted exclusivity period   30 months                
Revenue from collaboration agreement     $ 2,500   $ 200 $ 1,200 $ 1,200 $ 2,300    
Number of additional licensed specific radio frequencies | specific_radio_frequency 4       4   4      
Contract liability $ 4,000       $ 4,000   $ 4,000      
Number of installments | installment 2       2   2      
Proprietary Circuit Designs using XBAR Technology | Murata Manufacturing Co., Ltd. | Minimum                    
Disaggregation of Revenue [Line Items]                    
Prepaid royalties $ 8,000       $ 8,000   $ 8,000      
Proprietary Circuit Designs using XBAR Technology | Murata Manufacturing Co., Ltd. | Maximum                    
Disaggregation of Revenue [Line Items]                    
Prepaid royalties $ 36,000       $ 36,000   $ 36,000      
Proprietary Circuit Designs using XBAR Technology | Murata Manufacturing Co., Ltd. | Accounts Receivable                    
Disaggregation of Revenue [Line Items]                    
Revenue from collaboration agreement       $ 2,000