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COMMITMENTS AND CONTINGENCIES - Additional Information (Details) | Dec. 31, 2018 USD ($) Employee multiple executive_officer | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
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Loss Contingencies [Line Items] |  |  |
Purchase commitments for inventory | $ 15,900,000 | $ 14,200,000 | $ 5,000,000
Lease obligations | $ 10,900,000 | $ 10,900,000 | $ 10,900,000
Commitment With Executive Officers [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Number of executive officers under agreement | executive_officer | 6 |  |
Number of employees under agreement | Employee | 1 |  |
Multiple of sum of average annual base salary and bonus agreement terms | multiple | 2 |  |

X
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