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v3.10.0.1

Subsequent Event (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |  |
Payments to Acquire Businesses, Gross |  | $ 30,684,000 | $ 0 | $ 0
Stock option price threshold |  | $ 19.00 |  |
Subsequent Event [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Common Stock, Par or Stated Value Per Share | $ 1.00 |  |  |
Business Combination, Contingent Consideration, Asset, Current | $ 3.80 |  |  |
Subsequent Event [Member] | Common Shares |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Payments to Acquire Businesses, Gross | $ 0.1378 |  |  |

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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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