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Leases - Narrative (Details) $ in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2019 USD ($) ft² renewal_term | Jan. 01, 2019 USD ($) | Dec. 31, 2018 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Operating lease right-of-use assets | $ 35.8 | $ 26.7 | $ 0.0
Finance lease right-of-use asset |  | 15.3 |
Operating lease liabilities | 51.8 | 40.4 |
Finance lease liability | $ 15.2 | 15.9 |
Accumulated Deficit | Accounting Standards Update 2016-02 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cumulative-effect adjustment to retained earnings |  | $ 2.1 |
Building |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Leased square footage | ft² | 87,000 |  |
Lessee leasing arrangements, operating leases, number of renewal terms | renewal_term | 0 |  |
Leased Buildings -6350 Sequence Drive |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Leased square footage | ft² | 132,600 |  |
Leased Buildings -6340 Sequence Drive, 6310 Sequence Drive, 6290 Sequence drive |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Leased square footage | ft² | 219,000 |  |
Lessee leasing arrangements, operating leases, number of renewal terms | renewal_term | 2 |  |
Leased Buildings -232 South Dobson Road |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Leased square footage | ft² | 148,800 |  |
Lessee leasing arrangements, operating leases, number of renewal terms | renewal_term | 4 |  |
Lessee, operating lease, renewal term | 5 years |  |

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- Definition Present value of lessee's discounted obligation for lease payments from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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