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Fair Value Measurement - Roll Forward for Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Level 3) (Detail) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Nov. 30, 2014 | Dec. 31, 2013 | Dec. 31, 2015
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Add Change in fair value of warrant liability | $ 155,000 | $ (427,000) | $ (988,000) | $ 347,000 | $ (2,327,000) | $ (4,076,000) | $ 3,654,000 | $ 327,000 | $ 913,587 | $ 2,422,451 | $ 2,422,451 | $ 3,253,253 |
Warrant Liabilities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at December 31, 2014 |  |  |  | 1,684,551 |  |  |  |  | 1,684,551 |  |  |  |
Add Change in fair value of warrant liability |  |  |  |  |  |  |  |  | (913,587) |  |  |  |
Balance at December 31, 2015 | 770,964 |  |  |  | 1,684,551 |  |  |  | 770,964 | 1,684,551 |  |  |
Balance at December 31, 2015 | 770,964 |  |  | 1,684,551 | 1,684,551 |  |  |  | 1,684,551 | 1,684,551 |  |  | $ 770,964
Loan Payable Net of Discounts [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at December 31, 2014 |  |  |  | 15,020,417 |  |  |  |  | 15,020,417 |  |  |  |
Less repayments of principal |  |  |  |  |  |  |  |  | (4,778,485) |  |  |  |
Add accretion of discount |  |  |  |  |  |  |  |  | 92,097 |  |  |  |
Balance at December 31, 2015 | 10,334,029 |  |  |  | 15,020,417 |  |  |  | 10,334,029 | 15,020,417 |  |  |
Current portion |  |  |  |  |  |  |  |  |  |  |  |  | 1,417,388
Non-current portion |  |  |  |  |  |  |  |  |  |  |  |  | 8,916,641
Balance at December 31, 2015 | $ 10,334,029 |  |  | $ 15,020,417 | $ 15,020,417 |  |  |  | $ 15,020,417 | $ 15,020,417 |  |  | $ 10,334,029

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- Definition Fair Value Measurement With Unobservable Inputs Reconciliations Recurring Basis Liability Value Current + References No definition available. + Details
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- Definition Fair Value Measurement With Unobservable Inputs Reconciliations Recurring Basis Liability Value Noncurrent + References No definition available. + Details
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- Definition Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Amount of expense (income) related to adjustment to fair value of warrant liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section 25 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6939902&loc=d3e20148-110875 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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