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COMMITMENTS AND CONTINGENCIES - Narrative (Details) $ in Thousands |  |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jan. 08, 2019 defendant | Jul. 16, 2018 USD ($) | Apr. 02, 2018 USD ($) | Mar. 29, 2016 plaintiff | Jan. 31, 2016 claim | May 31, 2013 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Commitments and Contingencies Disclosure [Abstract] |  |  |  |  |  |  |  |
Rent expense for operating leases |  |  |  |  |  |  | $ 2,200 | $ 2,000
Number of days to provide notification to terminate purchase commitment agreement |  |  |  |  |  | 90 days |  |
Minimum monthly purchase amount |  |  |  |  |  | $ 40 |  |
Employment Agreements |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Number of weeks (months) to provide notice of termination of agreement by either party |  |  |  |  |  |  | 1 month |
Securities Class Actions |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Number of complaints filed | claim |  |  |  |  | 2 |  |  |
Number of lead plaintiffs named | plaintiff |  |  |  | 2 |  |  |  |
Litigation settlement amount |  |  | $ 1,750 |  |  |  |  |
Securities Class Actions | Subsequent Event | Executive Officers |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Number of parties named in putative securities class action suit | defendant | 2 |  |  |  |  |  |  |
Shareholder Derivative Claims |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Litigation settlement amount |  | $ 250 |  |  |  |  |  |

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