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Acquisition (Details)
6 Months Ended 12 Months Ended
Jan. 22, 2018
USD ($)
Oct. 20, 2017
USD ($)
Mar. 31, 2018
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Sep. 30, 2016
USD ($)
Business Acquisition [Line Items]                
Goodwill     $ 155,982,000 $ 131,995,000     $ 129,921,000 $ 109,448,000
Accelerated                
Business Acquisition [Line Items]                
Total purchase price consideration $ 19,059,000              
Cash paid at closing 16,759,000              
Cash acquired 300,000              
Goodwill $ 6,062,000              
Weighted average use life of acquired intangibles 5 years 6 months              
Revenues     6,200,000          
Net (loss) income     1,400,000          
Acquisition costs     300,000          
Earn-out payment installments 2              
TempAlert                
Business Acquisition [Line Items]                
Purchase price before working capital adjustments   $ 45,000,000            
Total purchase price consideration   40,741,000            
Cash paid at closing   40,741,000            
Cash acquired   600,000            
Goodwill   $ 17,552,000            
Weighted average use life of acquired intangibles   6 years 6 months            
Revenues     5,700,000          
Net (loss) income     (3,100,000)          
Acquisition costs     1,400,000 400,000        
Purchased and Core Technology | Accelerated                
Business Acquisition [Line Items]                
Estimated useful life of finite lived intangibles 5 years              
Purchased and Core Technology | TempAlert                
Business Acquisition [Line Items]                
Estimated useful life of finite lived intangibles   5 years            
Customer Relationships | Accelerated                
Business Acquisition [Line Items]                
Estimated useful life of finite lived intangibles 7 years              
Customer Relationships | TempAlert                
Business Acquisition [Line Items]                
Estimated useful life of finite lived intangibles   7 years            
Trademarks and Trade Names | Accelerated                
Business Acquisition [Line Items]                
Estimated useful life of finite lived intangibles 5 years              
Trademarks and Trade Names | TempAlert                
Business Acquisition [Line Items]                
Estimated useful life of finite lived intangibles   5 years            
Order backlog | Accelerated                
Business Acquisition [Line Items]                
Estimated useful life of finite lived intangibles 1 year              
Earn-out payments | Accelerated                
Business Acquisition [Line Items]                
Earn-out payment maximum $ 4,500,000              
Additional earn-out payment | Accelerated                
Business Acquisition [Line Items]                
Earn-out payment maximum 2,000,000              
Fair Value, Measurements, Recurring | Contingent Consideration | Estimate of Fair Value Measurement                
Business Acquisition [Line Items]                
Contingent consideration fair value     8,263,000 $ 6,388,000        
Fair Value, Measurements, Recurring | Contingent Consideration | Estimate of Fair Value Measurement | Accelerated                
Business Acquisition [Line Items]                
Contingent consideration fair value $ 2,300,000   2,300,000          
Fair Value, Measurements, Recurring | Contingent Consideration | Estimate of Fair Value Measurement | TempAlert                
Business Acquisition [Line Items]                
Contingent consideration fair value   $ 0 $ 0          
Forecast | Earn-out payments | TempAlert                
Business Acquisition [Line Items]                
Earn-out payment maximum         $ 45,000,000 $ 35,000,000