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Convertible Notes Payable (Tables) | 12 Months Ended
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Dec. 31, 2017
Debt Disclosure [Abstract] |
Summary of Common Stock and Preferred Stock Shares Issued under Notes and New Notes | The Company has issued shares of Common Stock and Preferred Stock as payments of principal (including certain early repayments at the option of the holders) and effected a retirement under the Notes and New Notes as follows:
|  | Number of Shares of Common Stock |  |  | Number of Shares of Preferred Stock |  |  | Applicable Conversion Price |  |  | Reduction in Principal |
January 12, 2017 |  |  | 11,753 |  |  |  | — |  |  | $ | 126.00 |  |  | $ | 1,478,318 |
January 26 - February 1, 20171 |  |  | 4,857 |  |  |  | — |  |  | $ | 112.00 |  |  | $ | 544,000 |
February 10, 2017 |  |  | 43,882 |  |  |  | — |  |  | $ | 70.00 |  |  | $ | 3,045,817 |
February 23 - March 2, 20171 |  |  | 2,571 |  |  |  | — |  |  | $ | 49.00 |  |  | $ | 125,999 |
March 13, 2017 |  |  | 117,297 |  |  |  | — |  |  | $ | 38.50 |  |  | $ | 4,417,829 |
April 10, 2017 |  |  | 169,061 |  |  |  | — |  |  | $ | 21.00 |  |  | $ | 3,621,286 |
May 9, 2017 |  |  | 109,367 |  |  |  | — |  |  | $ | 17.50 |  |  | $ | 1,913,915 |
June 7 / July 2, 2017 Exchange Agreement2 |  |  | 689,796 |  |  |  | 4,200 |  |  | $ | 6.09 |  |  | $ | 4,200,000 |
July 7, 2017 |  |  | 114,286 |  |  |  | — |  |  | $ | 17.50 |  |  | $ | 2,000,000 |
August 4, 2017 |  |  | 38,906 |  |  |  | — |  |  | $ | 24.50 |  |  | $ | 1,015,848 |
August 28, 2017 Restructuring Agreement3 |  |  | 117,171 |  |  |  | — |  |  | $ | 10.50 |  |  | $ | 1,200,000 |
November 6, 2017 Warrant Exchange4 |  |  | — |  |  |  | — |  |  | $ | — |  |  | $ | 279,016 |
November 15, 2017 Exchange Agreements5 |  |  | 97,448,072 |  |  |  | — |  |  | $ | 0.08 |  |  | $ | 8,130,564 |
Retirement per December 28, 2017 Exchange Agreements6 |  |  | — |  |  |  | — |  |  | $ | — |  |  | $ | 553,234 |
December 28, 2017 Exchange Agreements6 |  |  | 123,708,735 |  |  |  | — |  |  | $ | 0.02 |  |  | $ | 2,474,174 |
Total |  |  | 222,575,755 |  |  |  |  |  |  |  |  |  |  | $ | 35,000,000 |
1 During the periods referenced above, the Company and the holders of the Notes agreed to a temporary reduction in the conversion price in order to encourage voluntary conversion of Notes by the holders thereof. 2 On July 2, 2017, the Company entered into an exchange agreement with one of its investors which had purchased Notes, for $4.2 million aggregate principal amount of such Notes for 4,200 shares of Series A Preferred Stock. The Series A Preferred Stock shares were issued to address a short-term valuation issue for 689,796 common shares delivered to the Notes holders to close an installment period. Through the Series A Preferred Shares placement, the Company was able to value the open installment shares such that the amount of debt remaining under the Notes was reduced by $4.2 million. Additionally, the Company recognized a loss on debt settlement of $1.0 million related to this transaction. 3 On August 28, 2017, the Company entered into a restructuring agreement with one of its investors which had purchased Notes. The restructuring agreement included a provision to exchange 117,171 shares for $1.2 million aggregate principal amount of such Notes. Additionally, the Company recognized a loss on debt settlement of $1.9 million related to this transaction. 4 On October 10, 2017, the Company entered into an amendment to the August 28, 2017 Restructuring Agreement which included a provision to exchange debt for the issuance of warrants. Additionally, the Company recognized a loss on debt extinguishment of $2.3 million. 5On November 15, 2017, the Company entered into an exchange agreement which included a provision to exchange 973,764 shares for $0.6 million aggregate principal amount of such Notes. Additionally, the Company issued 96.5 million shares for $7.5 million aggregate principal amount of Notes under the updated conversion price formula as discussed in more detail above. Additionally, the Company recognized a loss on debt extinguishment of $21.0 million in connection with the issuance of the New Notes and warrants as part of such exchange. 6On December 28, 2017, the Company entered into an exchange agreement to retire $0.6 million aggregate principal amount of Notes and to issue 123.7 million shares and rights for shares for the remaining $2.5 million aggregate principal amount of Notes. Additionally, the Company recognized a loss on debt extinguishment of $3.7 million.

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- Definition Tabular disclosure of information on an original debt issue that has been converted in a noncash (or part noncash) transaction during the accounting period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. The information may be presented entirely or partially in this block of text or in the associated elements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 + Details
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