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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/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

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-Glossary Antidilution

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Glossary Diluted Earnings Per Share

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Contingent Stock Agreement

-URI http://asc.fasb.org/extlink&oid=6508534

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The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References

No definition available.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Glossary Other Comprehensive Income

-URI http://asc.fasb.org/extlink&oid=6519514

Reference 4: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Glossary Net Income

-URI http://asc.fasb.org/extlink&oid=6518256

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-Name Accounting Standards Codification

-Topic 944

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-Section S99

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-Subparagraph (SX 210.7-04.19)

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-Topic 225

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-Subparagraph (SX 210.5-03.18)

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-Topic 944

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-Subparagraph (SX 210.7-04.22)

-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 19

-Article 5

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 20

-Article 9

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

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-Section 45

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The amount of preferred stock dividends that is an adjustment to net income apportioned to common stockholders.

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No definition available.

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Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS).

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No definition available.

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Computation of Basic and Diluted Earnings Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Basic and diluted net loss per share (in thousands, except per share amounts):
Net loss	$ (22,286)us-gaap_NetIncomeLoss	$ (29,819)us-gaap_NetIncomeLoss	$ (24,777)us-gaap_NetIncomeLoss	$ (13,840)us-gaap_NetIncomeLoss	$ (13,056)us-gaap_NetIncomeLoss	$ (15,675)us-gaap_NetIncomeLoss	$ (17,164)us-gaap_NetIncomeLoss	$ (20,825)us-gaap_NetIncomeLoss	$ (90,722)us-gaap_NetIncomeLoss	$ (66,720)us-gaap_NetIncomeLoss	$ (69,949)us-gaap_NetIncomeLoss
Preferred stock deemed dividend										(8,469)
Net loss allocable to common stockholders	$ (22,286)	$ (29,819)	$ (24,777)	$ (13,840)	$ (21,525)	$ (15,675)	$ (17,164)	$ (20,825)	$ (90,722)	$ (75,189)	$ (69,949)
Denominator for basic and diluted net loss per share allocable to common stockholders:
Weighted-average common shares outstanding	26,298	26,291	26,286	26,283	23,588	18,302	18,291	18,285	26,289	19,628	17,047
Net loss per share allocable to common stockholders - basic and diluted	$ (0.85)us-gaap_EarningsPerShareBasicAndDiluted	$ (1.13)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.94)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.53)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.91)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.86)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.94)us-gaap_EarningsPerShareBasicAndDiluted	$ (1.14)us-gaap_EarningsPerShareBasicAndDiluted	$ (3.45)us-gaap_EarningsPerShareBasicAndDiluted	$ (3.83)us-gaap_EarningsPerShareBasicAndDiluted	$ (4.10)us-gaap_EarningsPerShareBasicAndDiluted
Outstanding securities not included in diluted net loss per share calculation (in thousands):
Outstanding securities not included in diluted net loss per share calculation									7,422	7,293	2,827
Series B Convertible Preferred Stock
Outstanding securities not included in diluted net loss per share calculation (in thousands):
Outstanding securities not included in diluted net loss per share calculation									4,343	4,343
Stock Options and Stock Awards
Outstanding securities not included in diluted net loss per share calculation (in thousands):
Outstanding securities not included in diluted net loss per share calculation									1,998	1,704	1,556
Warrant
Outstanding securities not included in diluted net loss per share calculation (in thousands):
Outstanding securities not included in diluted net loss per share calculation									1,081	1,246	1,271