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Lease Exit Liability (Tables) | 12 Months Ended
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Dec. 31, 2015
Lease Exit Liability [Abstract] |
Changes in Lease Exit Liability | Changes in the lease exit liability are as follows (in thousands):
Accrual balance at December 31, 2013 |  | $ | $9,445 |
Principal payments |  |  | (1,439 | )
Accrual balance at December 31, 2014 |  |  | 8,006 |
Principal payments and other adjustments |  |  | (3,293 | )
Accrual balance at December 31, 2015 |  | $ | $4,713 |
During 2015, the Company corrected an immaterial error attributed to the estimated lease term that resulted in a reduction of research and development expense of $1.9 million.
Future Principal Payments Under Lease Agreement | Future principal payments to be made under the lease agreement as of December 31, 2015 are as follows (in thousands):
2016 |  | $ | 2,020 |
2017 |  |  | 2,281 |
2018 |  |  | 412 |
Total |  | $ | 4,713 |

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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=6453985&loc=d3e41502-112717 + Details
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- Definition Tabular disclosure of an entity's restructuring reserve that occurred during the period associated with the exit from or disposal of business activities or restructurings for each major type of cost. This element may also include a description of any reversal and other adjustment made during the period to the amount of an accrued liability for restructuring activities. This element may be used to encapsulate the roll forward presentations of an entity's restructuring reserve by type of cost and in total, and explanation of changes that occurred in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)(2)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 + Details
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