Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Additional Information (Details)

v3.19.2
Commitments and Contingencies - Additional Information (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Loss Contingencies [Line Items]          
Severance obligation change in control period     12 months    
Contingent severance obligation accrual $ 0   $ 0   $ 0
Cost of Revenues          
Loss Contingencies [Line Items]          
Royalty expense 1,247,000 $ 619,000 $ 1,698,000 $ 1,029,000  
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   $ 1,057,000    
Severance obligation change in control 1,407,000   1,407,000    
Severance obligation in event of termination with cause $ 88,000   $ 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%