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Acquisition (Details) - USD ($) |  |  |  |  | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 20, 2017 | Jan. 09, 2017 | Nov. 01, 2016 | Oct. 05, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2016
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | $ 149,333,000 | $ 111,116,000 | $ 131,995,000 |  |  | $ 109,448,000
Revenues |  |  |  |  | 45,197,000 | 45,175,000 |  |  |  |
Net loss |  |  |  |  | 4,569,000 | $ (2,357,000) |  |  |  |
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 | $ 17,341,000 |  |  |  |  |  |  |  |  |
Weighted average use life of acquired intangibles | 6 years 6 months |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  | 2,100,000 |  |  |  |  |
Net loss |  |  |  |  | 1,100,000 |  |  |  |  |
Acquisition costs |  |  |  |  | 1,400,000 |  | 400,000 |  |  |
SMART Temps |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Cash paid at closing |  | $ 28,800,000 |  |  |  |  |  |  |  |
Cash acquired |  | 500,000 |  |  |  |  |  |  |  |
Goodwill |  | 18,800,000 |  |  |  |  |  |  |  |
FreshTemp |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Cash paid at closing |  |  | $ 1,700,000 |  |  |  |  |  |  |
Earn-out payment maximum |  |  | 2,300,000 |  |  |  |  |  |  |
Goodwill |  |  | 2,700,000 |  |  |  |  |  |  |
Acquisition costs |  |  |  |  | 60,000 |  |  |  |  |
Bluenica Corporation |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Cash paid at closing |  |  |  | $ 2,900,000 |  |  |  |  |  |
Earn-out payment maximum |  |  |  | 11,600,000 |  |  |  |  |  |
Goodwill |  |  |  | $ 11,000,000 |  |  |  |  |  |
Earn-out payment installment period |  |  |  | 4 years |  |  |  |  |  |
Purchased and Core Technology | TempAlert |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Estimated useful life of finite lived intangibles | 5 years |  |  |  |  |  |  |  |  |
Customer Relationships | TempAlert |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Estimated useful life of finite lived intangibles | 7 years |  |  |  |  |  |  |  |  |
Trademarks and Trade Names | TempAlert |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Estimated useful life of finite lived intangibles | 5 years |  |  |  |  |  |  |  |  |
Earn-out payments | SMART Temps |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Earn-out payment maximum |  | 7,200,000 |  |  |  |  |  |  |  |
Additional earn-out payment | Bluenica Corporation |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Earn-out payment maximum |  |  |  | $ 3,500,000 |  |  |  |  |  |
Fair Value, Measurements, Recurring | Contingent Consideration | Estimate of Fair Value Measurement |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Contingent consideration fair value |  |  |  |  | 5,981,000 |  | $ 6,388,000 |  |  |
Fair Value, Measurements, Recurring | Contingent Consideration | Estimate of Fair Value Measurement | TempAlert |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Contingent consideration fair value | $ 0 |  |  |  | 0 |  |  |  |  |
Fair Value, Measurements, Recurring | Contingent Consideration | Estimate of Fair Value Measurement | SMART Temps |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Contingent consideration fair value |  | $ 10,000 |  |  | 0 |  |  |  |  |
Fair Value, Measurements, Recurring | Contingent Consideration | Estimate of Fair Value Measurement | FreshTemp |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Contingent consideration fair value |  |  | $ 1,300,000 |  | 300,000 |  |  |  |  |
Fair Value, Measurements, Recurring | Contingent Consideration | Estimate of Fair Value Measurement | Bluenica Corporation |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Contingent consideration fair value |  |  |  | $ 10,400,000 | $ 5,600,000 |  |  |  |  |
Forecast | Earn-out payments | TempAlert |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Earn-out payment maximum |  |  |  |  |  |  |  | $ 45,000,000 | $ 35,000,000 |

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