Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Additional Information (Details)

v3.19.2
Commitments and Contingencies - Additional Information (Details)
 3 Months Ended
Mar. 31, 2019
USD ($)
Employee
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Loss Contingencies [Line Items]      
Severance obligation change in control period 12 months    
Number of employee | Employee 1    
Severance obligation on event of acquisition or initial public offering. $ 140,000    
Contingent severance obligation accrual 0   $ 0
Cost of Revenues      
Loss Contingencies [Line Items]      
Royalty expense $ 451,000 $ 411,000  
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 $ 1,057,000    
Severance obligation change in control 1,407,000    
Severance obligation in event of termination with cause $ 88,000    
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%    
Minimum      
Loss Contingencies [Line Items]      
Equity valuation threshold limit in severance obligation $ 125,000,000