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RESTRUCTURING CHARGES (Tables) | 12 Months Ended
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Dec. 31, 2019
RESTRUCTURING CHARGES |
Schedule of restructuring charges | The following table presents restructuring charges recorded in operating expenses for the years ended December 31: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2019 |  | 2018 |  | 2017 |
​ | ​ | (in thousands) | ​
Contract terminations(1) | ​ | $ | — | ​ | $ | 427 | ​ | $ | — | ​
Severance and other(2) | ​ |  | — | ​ |  | 1,228 | ​ |  | 2,963 | ​
Total charges | ​ | $ | — | ​ | $ | 1,655 | ​ | $ | 2,963 | ​
(1) | Charges associated with the termination of noncancelable lease and consulting agreements.
(2) | Primarily severance payments resulting from a reduction in headcount of approximately 130 positions and other employee-related costs.

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