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Preferred Redeemable Convertible Stock - Schedule of Preferred Redeemable Convertible Stock (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Class Of Stock [Line Items] |  |  |
Effect of accretion to redemption value | $ 1,356,707 | $ 2,157,550 | $ 2,144,434
Conversion of warrants | $ 249,215 |  |
Preferred Redeemable Convertible Stock |  |  |
Class Of Stock [Line Items] |  |  |
Beginning balance, Shares | 23,271,702 | 23,055,356 |
Exercise of warrants, Shares |  | 216,346 |
Conversion of warrants, shares | (23,271,702) |  |
Ending balance, Shares |  | 23,271,702 | 23,055,356
Beginning balance, Amount | $ 43,106,906 | $ 40,724,356 |
Exercise of warrants, Amount |  | 225,000 |
Effect of accretion to redemption value | 1,356,707 | 2,157,550 |
Conversion of warrants | $ (44,463,613) |  |
Ending balance, Amount |  | $ 43,106,906 | $ 40,724,356

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- Definition Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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