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Balance Sheet Components (Narrative) (Details) | 1 Months Ended | 3 Months Ended | 4 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2017 USD ($) item | Sep. 30, 2017 item | Jun. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) item | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Jan. 31, 2017 USD ($) | Jul. 23, 2015 USD ($)
Balance Sheet Components [Line Items] |  |  |  |  |  |  |  |  |  |  |
Prepaid expenses and other current assets | $ 2,249,000 |  |  |  |  | $ 2,249,000 | $ 2,249,000 | $ 9,978,000 |  |  |
Receivable from Prior Landlord |  |  |  |  |  |  |  | 5,000,000 |  |  |
Other long-term assets | 45,000 |  |  |  |  | 45,000 | 45,000 | 9,813,000 |  |  |
Construction-in-progress |  |  |  |  |  |  |  | 5,800,000 |  |  |
Depreciation expense |  |  |  |  |  |  | 8,442,000 | 3,875,000 | $ 3,677,000 |  |
O’Brien Lease Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Balance Sheet Components [Line Items] |  |  |  |  |  |  |  |  |  |  |
Prepaid expenses and other current assets | 0 |  |  |  |  | 0 | 0 | 2,200,000 |  |  |
Other long-term assets |  |  |  |  |  |  |  | 9,600,000 |  |  |
Leasehold improvements | 9,600,000 |  |  |  |  | $ 9,600,000 | 9,600,000 |  |  |  |
Construction-in-progress |  |  |  |  |  |  |  | 5,200,000 |  |  |
Tenant improvements |  |  |  |  | $ 28,800,000 |  |  |  |  |  |
Peninsula Innovation Partners, LLC [Member] |  |  |  |  |  |  |  |  |  |  |
Balance Sheet Components [Line Items] |  |  |  |  |  |  |  |  |  |  |
Lease incentive receivable, noncurrent |  |  |  |  |  |  |  |  |  |  | $ 20,000,000
Receivable from Prior Landlord |  |  |  |  |  |  |  | $ 5,000,000 |  |  |
Peninsula Innovation Partners, LLC [Member] | Third Lease Amendment Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Balance Sheet Components [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase in receivable from Existing Landlord |  |  |  |  |  |  |  |  |  | $ 65,000 |
Increase in landlord payments |  |  |  |  |  |  |  |  |  | $ 65,000 |
Landlord payment received |  |  |  |  | $ 2,628,000 |  |  |  |  |  |
Peninsula Innovation Partners, LLC [Member] | Fourth Lease Amendment Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Balance Sheet Components [Line Items] |  |  |  |  |  |  |  |  |  |  |
Landlord payment received |  |  | $ 1,682,000 | $ 1,682,000 |  |  |  |  |  |  |
Peninsula Innovation Partners, LLC [Member] | Fifth Lease Amendment Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Balance Sheet Components [Line Items] |  |  |  |  |  |  |  |  |  |  |
Landlord payment received | $ 755,000 |  |  |  |  |  | $ 755,000 |  |  |  |
Number of buildings in which the term and rent abatement period were extended | item |  | 2 |  |  |  |  |  |  |  |  |
Number of buildings returned to Prior Landlord | item | 2 |  |  |  |  | 2 |  |  |  |  |

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- Definition Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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- Definition This item represents the current receivable for an incentive or inducement contractually stipulated between parties to a lease whereby the lessor has committed to provide the entity (lessee) with a cash payment as inducement to enter the lease. The receivable is due within one year. For classified balance sheets, this element represents the current amount receivable, that is amounts expected to be collected within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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