Common stock shares sold.

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- Definition

Debt Instrument, Covenant Terms, Market Capitalization

+ References

No definition available.

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- Definition

Debt Instrument, Covenant Terms, Unrestricted Cash

+ References

No definition available.

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- Definition

Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

+ References

No definition available.

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- Definition

Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585

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- Definition

Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

+ References

No definition available.

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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No definition available.

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Subsequent Events - Additional Information (Detail) - USD ($)				6 Months Ended
	Aug. 09, 2019	Jul. 10, 2019	Jul. 03, 2019	Jun. 30, 2019
Subsequent Event [Line Items]
Debt covenant, market capitalization				$ 250,000,000
Subsequent Event
Subsequent Event [Line Items]
Proceeds from sale of intellectual property			$ 17,000,000.0
Debt covenant, unrestricted cash	$ 7,000,000.0
Hercules Loan Agreement \| Subsequent Event
Subsequent Event [Line Items]
Reduction of indebtedness		$ 15,000,000.0
Loan amount outstanding		$ 30,000,000.0
Initial Installment \| Subsequent Event
Subsequent Event [Line Items]
Proceeds from sale of intellectual property			5,000,000.0
Installment Two \| Subsequent Event
Subsequent Event [Line Items]
Proceeds from sale of intellectual property			12,000,000.0
Equity Portion \| Subsequent Event
Subsequent Event [Line Items]
Proceeds from sale of intellectual property			$ 30,000,000.0
Total shares of common stock sold (in shares)			15,000,000
Price per share (in dollars per share)			$ 2.00