Build to suit lease asset, noncurrent.

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- Definition

Build-to-suit lease obligation, noncurrent.

+ References

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Cash and cash equivalents maximum investments maturity period.

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- Definition

Significant accounting policies.

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Working capital.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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- Definition

The cumulative difference between the rental payments required by a lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense over the term of the leased property by the lessor or lessee, respectively.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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No definition available.

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The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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- Definition

Amount before accumulated depreciation of additions or improvements to assets held under a lease arrangement.

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- Definition

Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

+ References

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- Definition

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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- Definition

Present value of lessee's discounted obligation for lease payments from operating lease.

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- Definition

Amount of lessee's right to use underlying asset under operating lease.

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- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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- Definition

Indicates type of revenue from product and service.

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Amount received for services rendered and products shipped, but not yet billed, for non-contractual agreements due within one year or the normal operating cycle, if longer.

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No definition available.

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Summary of Significant Accounting Policies - Additional Information (Detail)	1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Jul. 31, 2016 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018	Jun. 30, 2019 USD ($) Segment	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)	Jan. 01, 2019 USD ($)
Significant Accounting Policies [Line Items]
Cash and cash equivalents		$ 48,384,000		$ 48,384,000		$ 56,992,000
Accumulated deficit		(459,641,000)		(459,641,000)		(450,565,000)
Working capital		47,400,000		$ 47,400,000
Number of operating segment \| Segment				1
Cash and cash equivalents maturity period				Three months or less
Impairments of long-lived assets				$ 0		0
Revenue from product development award		$ 3,054,000		$ 4,753,000
Type of Revenue [Extensible List]		us-gaap:GrantMember	us-gaap:GrantMember	us-gaap:GrantMember	us-gaap:GrantMember
Unbilled receivable		$ 2,000,000		$ 2,000,000
Cash flows from financing activities				13,000	$ 1,931,000
Build-to-suit lease asset						8,651,000
Build-to-suit lease obligation						$ 7,324,000
Operating lease ROU assets		9,501,000		9,501,000
Operating lease obligation		11,500,000		11,500,000
ASU 2016-02 [Member]
Significant Accounting Policies [Line Items]
Operating lease ROU assets							$ 10,400,000
Leasehold improvements							2,100,000
Operating lease obligation							12,600,000
ASU 2016-02 [Member] \| Restatement Adjustment [Member]
Significant Accounting Policies [Line Items]
Accumulated deficit							1,300,000
Cash flows from investing activities					(1,900,000)
Cash flows from financing activities					$ 1,900,000
Deferred rent							(100,000)
ASU 2016-02 [Member] \| Restatement Adjustment [Member] \| 1020 Marsh Road, Menlo Park, California [Member]
Significant Accounting Policies [Line Items]
Build-to-suit lease asset							(8,600,000)
Build-to-suit lease obligation							$ (7,300,000)
Cancer Prevention & Research Institute of Texas [Member]
Significant Accounting Policies [Line Items]
Revenue from product development award	$ 20,000,000
Cancer Prevention & Research Institute of Texas [Member] \| Aravive Biologics [Member]
Significant Accounting Policies [Line Items]
Revenue from product development award				$ 4,800,000
Type of Revenue [Extensible List]				us-gaap:GrantMember
Grant [Member] \| Cancer Prevention & Research Institute of Texas [Member] \| Aravive Biologics [Member] \| Prepaids and Other Current Assets [Member]
Significant Accounting Policies [Line Items]
Unbilled receivable		$ 2,000,000		$ 2,000,000
Assembled Workforce [Member]
Significant Accounting Policies [Line Items]
Estimated useful life of intangible assets				3 years
Minimum [Member]
Significant Accounting Policies [Line Items]
Property and equipment estimated useful lives				3 years
Maximum [Member]
Significant Accounting Policies [Line Items]
Property and equipment estimated useful lives				5 years