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BUSINESS COMBINATIONS - Additional Information (Details) - Adesis, Inc. [Member] |  |  | 12 Months Ended
--- | --- | --- | ---
Jul. 11, 2016 USD ($) | Jun. 23, 2016 USD ($) Employee | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Business Acquisition [Line Items] |  |  |  |  |
Business acquisition agreement date |  |  | Jun. 23, 2016 |  |
Number of employees in contract research organization | Employee |  | 43 |  |  |
Shares acquired for cash | $ 33,900,000 | $ 33,872,000 |  |  |
Transaction closed date |  |  | Jul. 11, 2016 |  |
Basis for additional consideration payable |  |  | if revenues exceeded certain threshold levels at the end of each twelve-month period ended December 31, 2016 and December 31, 2017. |  |
Additional cash consideration earned by former shareholders |  |  |  | $ 1,200,000 | $ 1,200,000
Selling, General and Administrative Expense [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business acquisition, transaction costs |  |  |  |  | $ 360,000
Maximum [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Additional cash contingent payable upon achievement of milestone | $ 2,400,000 |  |  |  |
Additional consideration payable upon achievement of each milestone |  |  | $ 1,200,000 |  |

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