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FAIR VALUE - Rollforward (Details) - USD ($) $ in Thousands | 3 Months Ended
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Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Mar. 31, 2018
Contingent Consideration |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance | $ 980 | $ 980 | $ 0 | $ 0
Adjustment to fair value included in earnings | 0 | 0 | 0 |
Ending balance | 980 | 980 | 0 | 0
Warrant Liability |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance | 0 | 0 | 12,182 | 8,701
Adjustment to fair value included in earnings | 0 | 0 | 591 |
Ending balance | $ 0 | $ 0 | $ 12,773 | 12,182
GS 1.8% Warrants | Warrant Liability |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Extinguishment of GS 1.8% warrant liability |  |  |  | (8,701)
GS 2.2% Warrants | Warrant Liability |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
GS 2.2% warrant liability |  |  |  | $ 12,182
Common Class A | GS 1.8% Warrants |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Warrant, percentage of outstanding stock available for purchase |  |  |  | 1.80%
Common Class A | GS 2.2% Warrants |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Warrant, percentage of outstanding stock available for purchase |  |  | 2.20% | 2.20%

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