Commitments and contingencies.

No definition available.

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- Definition

Lease Area, Number of Buildings

+ References

No definition available.

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- Definition

Lease area space occupancy.

+ References

No definition available.

+ Details

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- Definition

Lessee Leasing Arrangements, Capital Leases, Term of Contract

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No definition available.

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- Definition

Line of Credit Facility, Accounts Receivable Borrowing Base Percentage

+ References

No definition available.

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- Definition

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

+ References

No definition available.

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- Definition

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.

+ References

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)(3)
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-SubTopic 20
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-Paragraph 1
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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 4
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-Paragraph 3
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- Definition

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

+ References

No definition available.

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- Definition

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

+ 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 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-SubTopic 20
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-Paragraph 3
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Balance Type:	credit
Period Type:	instant

- 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.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

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.

+ 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 210.5-02.19(b),22(b))
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- Definition

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
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- Definition

Contractually required future rental payments receivable on noncancelable subleasing arrangements.

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-Subparagraph (b)
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- Definition

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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
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- Definition

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.

+ References

No definition available.

+ Details

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- Definition

In accordance with the provisions of their lease agreement, this element represents allowable charges due a landlord from its tenant. In retail store and office building leases, for example, tenant reimbursements may cover items such as taxes, utilities, and common area expenses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Commitments and Contingencies - Textual (Details)		1 Months Ended			3 Months Ended		12 Months Ended	24 Months Ended
Commitments and Contingencies - Textual (Details)	Jun. 30, 2017 USD ($)	Apr. 30, 2017 USD ($)	Feb. 28, 2017 USD ($)	Dec. 31, 2016	Mar. 31, 2018 USD ($) ft² building	Mar. 31, 2017 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2017 USD ($)
Commitments and Contingencies [Line Items]
Incentive from lessor					$ 800,000				$ 900,000
Asset retirement obligations					200,000				200,000
Accretion expense related to asset retirement obligation					0	$ 0
Rent expense					800,000	900,000
Operating lease, sublease rentals					300,000	300,000
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					$ 1,400,000
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
Number of buildings leased \| building					4
Number of buildings with waived asset retirement obligation and extended lease term \| building					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%
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%
Standby Letters of Credit [Member]
Commitments and Contingencies [Line Items]
Non-current restricted cash					$ 700,000	$ 700,000			700,000
Indemnification Agreement [Member]
Commitments and Contingencies [Line Items]
Loss contingency accrual					$ 0				$ 0