Commitments and contingencies.

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Debt Instrument, Minimum Cash Multiplier of Average Six-Month Trailing Operating Cash Flow Net Outlay Plus the Average Monthly Principal Due and Payable in the Immediately Succeeding Three-Months

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No definition available.

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Lease Area, Number of Buildings

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Lease area space occupancy.

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Lessee Leasing Arrangements, Capital Leases, Term of Contract

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Line of Credit Facility, Accounts Receivable Borrowing Base Percentage

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Waived Asset Retirement Obligation And Extended Lease Term, Number Of Buildings

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The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

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Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.

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The increase during the period in capital lease obligations due to entering into new capital leases.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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No definition available.

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Contractual interest rate for funds borrowed, under the debt agreement.

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- Definition

This item represents the deferred credit for an incentive or inducement received by a lessee from a lessor, in order to motivate the lessee to enter the lease agreement, which incentive or inducement is to be recognized as a reduction of rental expense over the lease term.

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- Definition

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

No definition available.

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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Amount of loss contingency liability expected to be resolved within one year or the normal operating cycle, if longer.

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Contractually required future rental payments receivable on noncancelable subleasing arrangements.

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The total amount of sublease rental income recognized during the period that reduces the entity's rent expense incurred under operating leases.

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The cash outflow for acquisition of or capital improvements to properties held for investment (operating, managed, leased) or for use.

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Net cash outflow or inflow from monetary allowance granted by the landlord to a tenant to entice tenant to move into landlords building which will enable the tenant to prepare the leased premises for tenants occupancy.

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The noncurrent cash, cash equivalents and investments that is restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits classified as long-term; that is not expected to be released from such existing restrictions within one year of the balance sheet date or operating cycle, whichever is longer. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. Includes noncurrent cash equivalents and investments that are similarly restricted as to withdrawal, usage or disposal.

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Commitments and Contingencies - Textual (Details)		1 Months Ended			3 Months Ended		9 Months Ended		12 Months Ended	24 Months Ended
Commitments and Contingencies - Textual (Details)	Jun. 30, 2017 USD ($) multiplier	Apr. 30, 2017 USD ($)	Feb. 28, 2017 USD ($)	Dec. 31, 2016	Sep. 30, 2018 USD ($) ft² building	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) ft² building	Sep. 30, 2017 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2017 USD ($)
Commitments and Contingencies [Line Items]
Incentive from lessor					$ 600,000		$ 600,000				$ 900,000
Asset retirement obligations					200,000		200,000				200,000
Accretion expense related to asset retirement obligation					0	$ 0	0	$ 0
Rent expense					800,000	800,000	2,400,000	2,300,000
Operating lease, sublease rentals					300,000	$ 300,000	900,000	$ 1,000,000
Capital leases, term of contract		3 years	3 years	3 years
Capital lease obligations incurred		$ 300,000	$ 400,000
Operating lease, future minimum sublease rentals					$ 700,000		$ 700,000
Fifth Amendment [Member]
Commitments and Contingencies [Line Items]
Payments for capital improvements									$ 3,600,000
Tenant reimbursements										$ 3,100,000
Headquarters, Redwood City [Member] \| Sixth Amendment [Member]
Commitments and Contingencies [Line Items]
Lease area space occupancy (square feet) \| ft²					107,200		107,200
Number of buildings leased \| building					4		4
Number of buildings with waived asset retirement obligation and extended lease term \| building					1		1
Term Loan [Member]
Commitments and Contingencies [Line Items]
Borrowing capacity	$ 10,000,000
Revolving Credit Facility [Member]
Commitments and Contingencies [Line Items]
Borrowing capacity	$ 5,000,000
Accounts receivable borrowing base percentage	80.00%
Stated interest rate	5.00%
Minimum cash multiplier \| multiplier	6
LIBOR [Member] \| Term Loan [Member]
Commitments and Contingencies [Line Items]
Basis spread on variable rate	3.60%
Prime Rate [Member] \| Revolving Credit Facility [Member]
Commitments and Contingencies [Line Items]
Basis spread on variable rate	1.00%
Indemnification Agreement [Member]
Commitments and Contingencies [Line Items]
Loss contingency accrual											0
Demand Deposits [Member]
Commitments and Contingencies [Line Items]
Non-current restricted cash					$ 700,000		$ 700,000				$ 700,000