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Summary of Significant Accounting Policies - Basic and Dilutive Net Loss per Share Computations (Detail) (USD $) | 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
Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net loss from continuing operations | $ (10,108,000)us-gaap_IncomeLossFromContinuingOperations | $ (2,620,000)us-gaap_IncomeLossFromContinuingOperations | $ (11,971,000)us-gaap_IncomeLossFromContinuingOperations | $ (7,562,000)us-gaap_IncomeLossFromContinuingOperations | $ (6,848,000)us-gaap_IncomeLossFromContinuingOperations | $ (7,126,000)us-gaap_IncomeLossFromContinuingOperations | $ (5,745,000)us-gaap_IncomeLossFromContinuingOperations | $ (6,268,000)us-gaap_IncomeLossFromContinuingOperations | $ (32,260,663)us-gaap_IncomeLossFromContinuingOperations | $ (25,986,692)us-gaap_IncomeLossFromContinuingOperations | $ (27,971,259)us-gaap_IncomeLossFromContinuingOperations
Net loss from discontinued operations |  |  |  |  |  |  |  |  | (480,611)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | (452,467)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | (519,894)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
Net loss |  |  |  |  |  |  |  |  | $ (32,741,274)us-gaap_NetIncomeLoss | $ (26,439,159)us-gaap_NetIncomeLoss | $ (28,491,153)us-gaap_NetIncomeLoss
Weighted average shares outstanding used to compute basic and diluted net loss per share |  |  |  |  |  |  |  |  | 61,612,957 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted | 43,422,001 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted | 28,824,417 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted
Basic and diluted net loss per share from continuing operations | $ (0.15)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare | $ (0.04)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare | $ (0.21)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare | $ (0.14)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare | $ (0.13)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare | $ (0.17)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare | $ (0.14)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare | $ (0.16)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare | $ (0.52)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare | $ (0.60)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare | $ (0.97)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare
Basic and diluted net loss per share from discontinued operations | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare | $ (0.01)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare | $ (0.01)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare | $ (0.01)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare | $ (0.01)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare | $ (0.02)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare
Basic and diluted net loss per share | $ (0.15)us-gaap_EarningsPerShareBasicAndDiluted | $ (0.04)us-gaap_EarningsPerShareBasicAndDiluted | $ (0.21)us-gaap_EarningsPerShareBasicAndDiluted | $ (0.14)us-gaap_EarningsPerShareBasicAndDiluted | $ (0.13)us-gaap_EarningsPerShareBasicAndDiluted | $ (0.17)us-gaap_EarningsPerShareBasicAndDiluted | $ (0.15)us-gaap_EarningsPerShareBasicAndDiluted | $ (0.17)us-gaap_EarningsPerShareBasicAndDiluted | $ (0.53)us-gaap_EarningsPerShareBasicAndDiluted | $ (0.61)us-gaap_EarningsPerShareBasicAndDiluted | $ (0.99)us-gaap_EarningsPerShareBasicAndDiluted

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- Definition 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. + Details
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- Definition Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests. + References 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4613673-111683 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.13) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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