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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended
May 15, 2020
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]            
Restricted cash   $ 1,300,000   $ 1,300,000   $ 1,300,000
Impairment of goodwill   0 $ 0 $ 0 $ 5,855,000  
Options previously granted vesting period       3 years    
Award accelerated service period       1 year    
Stock-based compensation expense in operating income   $ 1,573,000 1,630,000 $ 3,323,000 3,319,000  
ESPP            
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]            
Number of shares available for issuance (in shares) 100,000          
Shares remaining (in shares)   106,088   106,088    
Amended 2017 Plan            
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]            
Number of shares available for issuance (in shares) 1,425,000          
Incentive-Based Compensation Plan            
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]            
Stock-based compensation expense in operating income   $ 1,800,000 700,000 $ 3,100,000 1,400,000  
COVID-19 [Member]            
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]            
Equity method investment impairments       0    
Cost method investment impairments       $ 0    
Hondros College of Nursing Segment            
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]            
Impairment of goodwill     5,900,000      
Fair value of goodwill     $ 28,000,000.0   $ 28,000,000.0