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COMMITMENTS AND CONTINGENCIES (Tables) | 12 Months Ended
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Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract] |
Changes to Accrued Cease-Use Liability | The following table sets forth changes to the accrued cease-use liability during 2017 and 2016 (in thousands):
|  | Years Ended December 31, |
|  | 2017 |  |  | 2016 |
Beginning balance |  | $ | 853 |  |  | $ | 1,983 |
Change in estimate |  |  | (544 | ) |  |  | (830 | )
Payments |  |  | (247 | ) |  |  | (300 | )
Ending balance |  | $ | 62 |  |  | $ | 853 |
Estimated Future Annual Minimum Lease Payments | As of December 31, 2017, the total estimated future annual minimum lease payments under the Company’s non-cancelable building lease for the years ending after December 31, 2017 were as follows (in thousands):
|  | Payment Amount |
2018 |  | $ | 7,368 |
2019 |  |  | 7,589 |
2020 |  |  | 7,844 |
2021 |  |  | 8,079 |
2022 and thereafter |  |  | 74,000 |
Total future minimum lease payments |  | $ | 104,880 |

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- Definition Tabular disclosure of future minimum payments required in the aggregate and for each of the five succeeding fiscal years for operating leases having initial or remaining noncancelable lease terms in excess of one year and the total minimum rentals to be received in the future under noncancelable subleases as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 + Details
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