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Organization, Nature of Operations and Basis of Presentation - Schedule of Multi Clinic Acquisition (Details) - Clinic | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Business Acquisition [Line Items] |  |  |
Percentage of interest acquired | 35.00% |  |
Number of clinics | 2 |  |
January 2017 Acquisition [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Acquisition date | Jan. 01, 2017 |  |
Percentage of interest acquired | 70.00% |  |
Number of clinics | 17 |  |
May 2017 Acquisition [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Acquisition date | May 31, 2017 |  |
Percentage of interest acquired | 70.00% |  |
Number of clinics | 4 |  |
June 2017 Acquisition [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Acquisition date | Jun. 30, 2017 |  |
Percentage of interest acquired | 60.00% |  |
Number of clinics | 9 |  |
October 2017 Acquisition [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Acquisition date | Oct. 31, 2017 |  |
Percentage of interest acquired | 70.00% |  |
Number of clinics | 9 |  |
February 2016 Acquisition [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Acquisition date |  | Feb. 29, 2016 |
Percentage of interest acquired |  | 55.00% |
Number of clinics |  | 8 |
November 2016 Acquisition [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Acquisition date |  | Nov. 30, 2016 |
Percentage of interest acquired |  | 60.00% |
Number of clinics |  | 12 |
January 2015 Acquisition [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Acquisition date |  |  | Jan. 31, 2015
Percentage of interest acquired |  |  | 60.00%
Number of clinics |  |  | 9
April 2015 Acquisition [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Acquisition date |  |  | Apr. 30, 2015
Percentage of interest acquired |  |  | 70.00%
Number of clinics |  |  | 3
June 2015 Acquisition [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Acquisition date |  |  | Jun. 30, 2015
Percentage of interest acquired |  |  | 70.00%
Number of clinics |  |  | 4
December 2015 Acquisition [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Acquisition date |  |  | Dec. 31, 2015
Percentage of interest acquired |  |  | 59.00%
Number of clinics |  |  | 4

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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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