General form of registration statement for all companies including face-amount certificate companies

Fair Value Measurement - Summary of Changes in Fair Value of Warrant Liabilities Measured at Recurring Basis (Details)

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Fair Value Measurement - Summary of Changes in Fair Value of Warrant Liabilities Measured at Recurring Basis (Details) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Dec. 31, 2014
Fair Value Disclosures [Abstract]      
Derivative Liabilities, Beginning balance $ 1,350,881 $ 3,635,294 $ 9,511,364
Issuance of Series C derivative liability 529,905
Issuance of warrants 251,011 501,259
Change in classification 281,403 914,977
Change in fair value of derivative liability 2,038,366 (3,067,075) (2,975,597)
Extinguishment (4,345,355)
Derivative Liabilities, Ending balance 3,640,258 1,350,881 3,635,294
Warrants Payable, Beginning balance 77,761 63,533 1,216,000
Provision for new warrant issuances 969 6,059 66,963
Accrual of other warrant obligations 61,454 221,709
Changes in fair value of warrants payable 154,922 (201,621) (34,240)
Change in estimate (925,500)
Issuance of warrants (11,919) (259,690)
Warrants Payable, Ending balance $ 295,106 $ 77,761 $ 63,533