Amount of class of warrant or right issued.

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Amount of the conversion of preferred stock to common stock upon initial public offering shares.

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Amount of temporary equity shares issuance.

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- Definition

Exercise price per share or per unit of warrants or rights outstanding.

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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.

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- Definition

Face (par) amount of debt instrument at time of issuance.

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Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

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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.

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The cash inflow from issuance of callable preferred stock which is identified as being convertible to another type of financial security at the option of the issuer or the holder.

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Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

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Number of shares issued during the period as a result of the conversion of convertible securities.

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Note E - Preferred Stock and Warrants (Details Textual) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended			12 Months Ended
	Jun. 02, 2014	May 31, 2015	Apr. 30, 2015	Feb. 28, 2015	Dec. 31, 2013	Jun. 30, 2016	Dec. 31, 2015
Common Stock [Member] \| IPO [Member]
Stock Issued During Period, Shares, Conversion of Convertible Securities			5,980,564
Common Stock [Member] \| Deerfield Warrant [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights			1,923,077
Class of Warrant or Right, Exercise Price of Warrants or Rights			$ 5.85
Common Stock [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights					143,466	2,066,543
Class of Warrant or Right, Exercise Price of Warrants or Rights					$ 5.85
IPO [Member]
Stock Issued During Period, Shares, Conversion of Convertible Securities		5,980,564
Series D-1 Redeemable Convertible Preferred Stock [Member] \| Cowen KP Investment LLC [Member]
Temporary Equity Shares Issuance				3,200,000
Sale of Stock, Price Per Share				$ 1.25
Proceeds from Issuance of Redeemable Convertible Preferred Stock				$ 4.0
Conversion of Preferred Stock to Common Stock Upon Initial Public Offering Shares				415,584
Series D Redeemable Convertible Preferred Stock [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights					1,079,453	15,499,324
Convertible Notes Payable [Member]
Debt Instrument, Face Amount					$ 3.8
2013 Warrants [Member]
Class of Warrant or Right Issued					1,079,453
Deerfield Warrant [Member]
Class of Warrant or Right Issued	14,423,076
Preferred Stock, Shares Outstanding						0	0
Preferred Stock, Shares Authorized		10,000,000	10,000,000			10,000,000	10,000,000
Preferred Stock, Par or Stated Value Per Share		$ 0.0001	$ 0.0001			$ 0.0001	$ 0.0001