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Change in Fair Value of Derivative Liabilities (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015
Derivatives, Fair Value [Line Items] |  |  |
Beginning Balance | $ 8,170 | $ 7,519 | $ 7,519
Record derivative liability |  | 868 |
(Gain) loss on change in fair value of derivative liabilities | 1,250 | (464) |
Transfer derivative liability to equity |  | (1,814) |
Ending Balance | 9,420 | 6,100 | 8,170
Warrant |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Compensation income for change in fair value of warrants issued to former employees |  | (9) |
Warrants Issued October 2009 |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Beginning Balance |  | 119 | 119
(Gain) loss on change in fair value of derivative liabilities |  | (110) |
Warrants Issued October 2009 | Warrant |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Compensation income for change in fair value of warrants issued to former employees |  | (9) |
Embedded Derivative Financial Instruments |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Beginning Balance | 8,170 | 7,400 | 7,400
(Gain) loss on change in fair value of derivative liabilities | 1,250 | (1,300) |
Ending Balance | $ 9,420 | 6,100 | $ 8,170
Preferred Stock Purchase Option |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Record derivative liability |  | 868 |
(Gain) loss on change in fair value of derivative liabilities |  | 946 |
Transfer derivative liability to equity |  | $ (1,814) |

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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13495-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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