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Acquisition (Details) |  |  |  |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 22, 2018 USD ($) | Oct. 20, 2017 USD ($) | Jan. 09, 2017 USD ($) | Nov. 01, 2016 USD ($) | Oct. 05, 2015 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2016 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | $ 154,535,000 | $ 131,995,000 |  |  |  | $ 109,448,000
Accelerated Concepts |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash paid at closing | $ 16,430,000 |  |  |  |  |  |  |  |  |  |
Cash acquired | $ 200,000 |  |  |  |  |  |  |  |  |  |
Earn-out payment installment period | 2 |  |  |  |  |  |  |  |  |  |
Goodwill | $ 5,664,000 |  |  |  |  |  |  |  |  |  |
Weighted average useful life of acquired intangibles | 5 years 6 months |  |  |  |  |  |  |  |  |  |
Acquisition costs |  |  |  |  |  | 300,000 |  |  |  |  |
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual |  |  |  |  |  | 22,200,000 |  |  |  |  |
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual |  |  |  |  |  | 2,800,000 |  |  |  |  |
TempAlert |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash paid at closing |  | $ 40,741,000 |  |  |  |  |  |  |  |  |
Cash acquired |  | 600,000 |  |  |  |  |  |  |  |  |
Goodwill |  | $ 17,552,000 |  |  |  |  |  |  |  |  |
Weighted average useful life of acquired intangibles |  | 6 years 6 months |  |  |  |  |  |  |  |  |
Acquisition costs |  |  |  |  |  | 1,400,000 | 400,000 |  |  |  |
Payments to Acquire Business Gross before working capital adjustments |  | $ 45,000,000 |  |  |  |  |  |  |  |  |
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual |  |  |  |  |  | 17,000,000 |  |  |  |  |
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 |  |  |  |  |  |  |
Bluenica Corporation |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash paid at closing |  |  |  |  | $ 2,900,000 |  |  |  |  |  |
Business Combination, Contingent Liability, Payout Period |  |  |  |  | 4 years |  |  |  |  |  |
Earn-out payment maximum |  |  |  |  | $ 11,600,000 |  |  |  |  |  |
Goodwill |  |  |  |  | 11,000,000 |  |  |  |  |  |
Purchased and Core Technology | Accelerated Concepts |  |  |  |  |  |  |  |  |  |  |
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 Concepts |  |  |  |  |  |  |  |  |  |  |
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 Concepts |  |  |  |  |  |  |  |  |  |  |
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 Concepts |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated useful life of finite lived intangibles | 1 year |  |  |  |  |  |  |  |  |  |
Earn-out payments | Accelerated Concepts |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earn-out payment maximum | $ 4,500,000 |  |  |  |  |  |  |  |  |  |
Earn-out payments | SMART Temps |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earn-out payment maximum |  |  | 7,200,000 |  |  |  |  |  |  |  |
Additional earn-out payment | Accelerated Concepts |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earn-out payment maximum | 2,000,000 |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  | 10,065,000 | $ 6,388,000 |  |  |  |
Fair Value, Measurements, Recurring | Contingent Consideration | Estimate of Fair Value Measurement | Accelerated Concepts |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Contingent consideration fair value | $ 2,300,000 |  |  |  |  | 4,400,000 |  |  |  |  |
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 |  | 200,000 |  |  |  |  |
Fair Value, Measurements, Recurring | Contingent Consideration | Estimate of Fair Value Measurement | Bluenica Corporation |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Contingent consideration fair value |  |  |  |  | $ 10,400,000 | $ 5,500,000 |  |  |  |  |
Forecast | Earn-out payments | TempAlert |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earn-out payment maximum |  |  |  |  |  |  |  | $ 45,000,000 | $ 35,000,000 |  |

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