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Business Combinations, Goodwill and Intangible Assets - Additional Information (Details) - USD ($)
$ in Thousands
2 Months Ended 12 Months Ended
Dec. 22, 2017
Jun. 19, 2015
Feb. 27, 2018
Dec. 31, 2017
Business Acquisition [Line Items]        
Vesting period   4 years    
Health Integrated, Inc.        
Business Acquisition [Line Items]        
Initial purchase consideration $ 22,577      
Maximum contingent consideration 5,000      
Contingent cash consideration $ 920      
Acquisition related costs       $ 795
Health Integrated, Inc. | Customer relationships        
Business Acquisition [Line Items]        
Weighted average useful life 7 years      
Health Integrated, Inc. | Developed technology        
Business Acquisition [Line Items]        
Weighted average useful life 1 year      
Health Integrated, Inc. | Trade names and trademarks        
Business Acquisition [Line Items]        
Weighted average useful life 2 years      
Restricted Stock Units | Health Integrated, Inc. | Subsequent Event        
Business Acquisition [Line Items]        
Issued number of shares of restricted stock     4,444  
Issued shares of restricted stock, fair value     $ 275  
Vesting period     4 years