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Debt - Additional Information (Details) - USD ($)
12 Months Ended
Nov. 04, 2016
Dec. 31, 2017
Nov. 14, 2017
Dec. 31, 2016
Dec. 14, 2015
Debt Instrument [Line Items]          
Debt instrument, term 5 years 5 years      
Cost of assets under capital leases   $ 1,951,000   $ 1,951,000  
Accumulated depreciation of assets under capital leases   1,855,000   1,807,000  
Maximum          
Debt Instrument [Line Items]          
Bridge loan $ 1,000,000        
Secured Debt          
Debt Instrument [Line Items]          
Term loan, face amount 40,000,000        
Long-term debt   0 $ 38,500 40,000,000  
Revolving Credit Facility          
Debt Instrument [Line Items]          
Line of credit facility, maximum borrowing capacity 25,000,000       $ 25,000,000
Line of credit   0   $ 5,000,000  
Available borrowing capacity   $ 25,000,000      
Revolving Credit Facility | Maximum          
Debt Instrument [Line Items]          
Letter of credit commitments $ 2,500,000