Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Additional Information (Details)

v3.19.3
Commitments and Contingencies - Additional Information (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Loss Contingencies [Line Items]          
Contingent severance obligation accrual $ 0   $ 0   $ 0
Severance obligation change in control period     12 months    
Pearson Action          
Loss Contingencies [Line Items]          
Contingent severance obligation accrual 0   $ 0    
Cost of Revenues          
Loss Contingencies [Line Items]          
Royalty expense 862,000 $ 321,000 $ 2,560,000 $ 1,350,000  
Wireless Essential Patent Holders          
Loss Contingencies [Line Items]          
Royalty expire year     2021    
Other Providers of Integrated Technologies          
Loss Contingencies [Line Items]          
Royalty expire year     2023    
Maximum          
Loss Contingencies [Line Items]          
Severance obligation before change in control 1,342,000   $ 1,342,000    
Severance obligation change in control 1,667,000   1,667,000    
Severance obligation in event of termination with cause $ 240,000   $ 240,000    
Maximum | Wireless Essential Patent Holders          
Loss Contingencies [Line Items]          
Royalty payment percent of net revenues     5.00%    
Maximum | Other Providers of Integrated Technologies          
Loss Contingencies [Line Items]          
Royalty payment percent of net revenues     5.00%