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Other Long-Term Liabilities - Deferred (Details)
 12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Other Liabilities, Noncurrent [Line Items]    
Deferred payment arrangement number of sellers 1  
Deferred payment arrangements value $ 2,200,000 $ 3,100,000
Funds received from investor 2,800,000  
Asset Retirement Obligation    
Other Liabilities, Noncurrent [Line Items]    
Deferred rent and other facility costs $ 2,100,000 $ 1,900,000
Minimum    
Other Liabilities, Noncurrent [Line Items]    
Leasehold improvements and long-term liability amortization period 5 years  
Maximum    
Other Liabilities, Noncurrent [Line Items]    
Leasehold improvements and long-term liability amortization period 10 years