Annual report pursuant to Section 13 and 15(d)

Termination Costs - Additional Information (Details)

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Termination Costs - Additional Information (Details) - USD ($)
12 Months Ended
Jun. 30, 2018
May 02, 2018
Apr. 02, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Restructuring Cost And Reserve [Line Items]            
Stock compensation expense       $ 2,204,000 $ 2,910,000 $ 736,000
Mr. Charles Myers            
Restructuring Cost And Reserve [Line Items]            
Unvested options shares   283,000        
Number of monthly premiums for disability insurance   12 months        
Mr. Charles Myers | One Time Benefit            
Restructuring Cost And Reserve [Line Items]            
Severance amount paid in cash   $ 484,000        
Mr. Charles Myers | Other Employment Benefits            
Restructuring Cost And Reserve [Line Items]            
Severance amount paid in cash   20,000        
Mr. Charles Myers | Disability Insurance Plan            
Restructuring Cost And Reserve [Line Items]            
Severance amount paid in cash   $ 3,000        
Mr. Selbo            
Restructuring Cost And Reserve [Line Items]            
Severance amount paid in cash     $ 150,000      
Sales and Marketing Expense            
Restructuring Cost And Reserve [Line Items]            
Agreement termination costs $ 1,300,000          
Sales and Marketing Expense | Mr. Selbo            
Restructuring Cost And Reserve [Line Items]            
Stock compensation expense     $ 44,000      
General and Administrative Expense | Mr. Charles Myers            
Restructuring Cost And Reserve [Line Items]            
Stock compensation expense         $ 1,200,000