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Outstanding Stock Options and Stock Awards Excluded from Calculation of Net Loss Per Share (Detail) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Outstanding securities not included in diluted net income (loss) per share calculation (in thousands):
Outstanding securities not included in diluted net loss per share calculation	22,494,000	21,257,000	20,803,000	21,257,000
Warrants
Outstanding securities not included in diluted net income (loss) per share calculation (in thousands):
Outstanding securities not included in diluted net loss per share calculation		5,841,000	2,474,000	5,841,000
Stock Options and Stock Awards
Outstanding securities not included in diluted net income (loss) per share calculation (in thousands):
Outstanding securities not included in diluted net loss per share calculation	6,991,000	11,276,000	8,476,000	11,276,000
Convertible Notes
Outstanding securities not included in diluted net income (loss) per share calculation (in thousands):
Outstanding securities not included in diluted net loss per share calculation	11,363,000		5,713,000
Series B Convertible Preferred Stock
Outstanding securities not included in diluted net income (loss) per share calculation (in thousands):
Outstanding securities not included in diluted net loss per share calculation	4,140,000	4,140,000	4,140,000	4,140,000

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- Definition

Antidilutive securities excluded from computation of earning per share.

+ References

No definition available.

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- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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