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Common Stock Warrants - Additional Information (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Feb. 29, 2016 | Jun. 30, 2016 | Jun. 30, 2016 | Dec. 31, 2015
Class Of Warrant Or Right [Line Items] |  |  |  |
Aggregate number of unregistered shares of common stock called by warrants (in shares) | 165,000 |  |  |
Exercise price of warrants (in dollars per share) | $ 0.77 |  |  |
Exercisable period of warrants | 5 years |  |  |
Warrants expiration period | 2021-02 |  |  |
Estimated fair value of warrants | $ 100,000 |  |  |
December 2014 Revalued Warrants [Member] |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |
Gain (loss) on revaluation of warrant liability |  | $ 44,000 | $ 3,000,000 |
March 2012 Revalued Warrants [Member] |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |
Gain (loss) on revaluation of warrant liability |  | 3,200,000 | 7,200,000 |
Two Year Warrants Issued in December 2014 [Member] |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |
Estimated fair value of warrants |  | 0 | 0 | $ 3,000,000
Five Year Warrants Issued in March 2012 [Member] |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |
Estimated fair value of warrants |  | $ 300,000 | $ 300,000 | $ 7,500,000

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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + 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 Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 + Details
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- Definition Fair value portion of warrants not settleable in cash classified as equity. + 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 (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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