Convertible preferred stock	10 Months Ended
Dec. 31, 2014
Equity [Abstract]
Convertible preferred stock	Convertible preferred stock As of December 31, 2014, the Company had authorized 16,000,000 shares of Series A convertible preferred stock ("Series A Preferred Stock"), $0.0001 par value per share, for issuance. During March, April and May 2014, the Company issued an aggregate of 15,775,221 shares of Series A Preferred Stock for $1.00 per share, resulting in net proceeds to the Company of $15,637,032, which is also the carrying value of the Series A Preferred Stock as of December 31, 2014. As of December 31, 2014, the Company had authorized 14,500,000 shares of of Series B convertible preferred stock ("Series B Preferred Stock"), $0.0001 par value per share, for issuance. From July to October 2014, the Company issued an aggregate of 14,078,647 shares of Series B Preferred Stock for $1.81 per share, resulting in net proceeds to the Company of $25,394,135, which is also the carrying value of the Series B Preferred Stock as of December 31, 2014. In conjunction with the Company's IPO in February 2015, all shares of the Series A and Series B Preferred Stock converted into common stock (Note 14). As of December 31, 2014, the rights and privileges of the Series A and Series B Preferred Stock were as follows: Voting The holders of the Series A Preferred Stock and Series B Preferred Stock are entitled to vote, together with the holders of common stock, on all matters submitted to stockholders for a vote, except with respect to matters on which Delaware General Corporation Law requires that a vote will be by a separate class. Each Series A and Series B Preferred Stock holder is entitled to the number of votes equal to the number of shares of common stock into which each preferred share is convertible at the time of such vote. The holders of the outstanding Series A and Series B Preferred Stock, voting together as a single class, are entitled to elect two directors to the Company's Board of Directors. Certain actions undertaken by the Company require approval from 75% of the holders of the outstanding Series A Preferred Stock and 60% of the Series B Preferred Stock. These actions include a liquidation, dissolution or winding up of the Company, certain amendments to the certificate of incorporation, altering the terms of the existing preferred stock and increasing the number of authorized shares of preferred stock. Dividends The Company shall not declare, pay or set aside any dividends unless the holders of each series of convertible preferred stock then outstanding shall receive first, or simultaneously, in the case of a dividend on common stock, on a pari passu basis, a dividend in an amount that is at least equal to the amount that would have been received by the holders of the Series A and Series B Preferred Stock had all the Series A and Series B Preferred Stock been converted to common stock. In the event of a dividend on a class of stock that is not convertible to common stock, the holders shall receive a dividend in proportion to that received by the other classes of stock. Liquidation preference In the event of any liquidation, dissolution, winding up of the affairs or deemed liquidation event of the Company, the holders of the then-outstanding Series A and Series B Preferred Stock are entitled to receive, on a pari passu basis, in preference to the common stock holders, an amount equal to the greater of (1) $1.00 per share of Series A Preferred Stock and $1.81 per share of Series B Preferred Stock, plus all declared but unpaid dividends, or (2) such amount per share of Series A Preferred Stock and Series B Preferred Stock payable as if converted into common stock. Any remaining assets of the Company shall be distributed ratably among the holders of common stock. If the assets or surplus funds to be distributed to the holders of the Series A and Series B Preferred Stock are insufficient to permit the payment to such holders of their full preferential amount, the assets and surplus funds legally available for distribution shall be distributed ratably among the holders of the Series A and Series B Preferred Stock, pro rata, based upon the number of shares held. In the event of certain deemed liquidation events, holders of the Series A and Series B Preferred Stock may require the Company to redeem their shares at a price equal to the liquidation amount at that time. Conversion Each share of Series A and Series B Preferred Stock, at the option of the holder, is convertible into a number of fully paid shares of common stock as determined by dividing $1.00 for the Series A Preferred Stock and $1.81 for the Series B Preferred Stock, by the conversion price in effect at the time. The conversion price of Series A Preferred Stock and Series B Preferred Stock is $4.28 and $7.74 per share, respectively, as of December 31, 2014. The conversion price is subject to adjustment in accordance with provisions contained in the Company's certificate of incorporation. Conversion is automatic immediately upon the closing of a firm commitment underwritten public offering in which shares are sold to the public at a price of at least $8.57 per share (subject to appropriate adjustment for stock splits, stock dividends, combinations and other similar recapitalizations affecting the number of such shares issued and outstanding) for gross proceeds of at least $40,000,000, or upon the written election of 1) the holders of at least 75% of the then-outstanding shares of Series A Preferred Stock and 2) the holders of at least 60% of the then-outstanding shares of Series B Preferred Stock. The Company evaluated the Series A Preferred Stock and Series B Preferred Stock and determined both should be considered "equity hosts" and not "debt hosts" as defined by ASC 815, Derivatives and Hedging. These evaluations are necessary in order to determine if any embedded features of the Series A Preferred Stock or Series B Preferred Stock require bifurcation and, therefore, separate accounting as derivative liabilities. The Company's analyses followed the "whole instrument approach," which compares the individual features against the entire preferred stock instruments which include those features. The Company's analyses were based on consideration of the Series A Preferred Stock and Series B Preferred Stock's economic characteristics and risks, and more specifically, evaluated all the stated and implied substantive terms and features, including (i) whether the Series A Preferred Stock or Series B Preferred Stock included redemption or put features, (ii) whether the preferred stockholders were entitled to dividends, (iii) the voting rights of the Series A Preferred Stock and Series B Preferred Stock and (iv) the existence and nature of any conversion rights. As a result of the Company's determination that the Series A Preferred Stock and Series B Preferred Stock are "equity hosts," the embedded conversion features do not require bifurcation as derivative liabilities. In addition, as the contingent put features described above contain gross settlement provisions, these features also do not require bifurcation as derivative liabilities.

Convertible preferred stock

As of December 31, 2014, the Company had authorized 16,000,000 shares of Series A convertible preferred stock ("Series A Preferred Stock"), $0.0001 par value per share, for issuance. During March, April and May 2014, the Company issued an aggregate of 15,775,221 shares of Series A Preferred Stock for $1.00 per share, resulting in net proceeds to the Company of $15,637,032, which is also the carrying value of the Series A Preferred Stock as of December 31, 2014.

As of December 31, 2014, the Company had authorized 14,500,000 shares of of Series B convertible preferred stock ("Series B Preferred Stock"), $0.0001 par value per share, for issuance. From July to October 2014, the Company issued an aggregate of 14,078,647 shares of Series B Preferred Stock for $1.81 per share, resulting in net proceeds to the Company of $25,394,135, which is also the carrying value of the Series B Preferred Stock as of December 31, 2014.

In conjunction with the Company's IPO in February 2015, all shares of the Series A and Series B Preferred Stock converted into common stock (Note 14). As of December 31, 2014, the rights and privileges of the Series A and Series B Preferred Stock were as follows:

Voting

The holders of the Series A Preferred Stock and Series B Preferred Stock are entitled to vote, together with the holders of common stock, on all matters submitted to stockholders for a vote, except with respect to matters on which Delaware General Corporation Law requires that a vote will be by a separate class. Each Series A and Series B Preferred Stock holder is entitled to the number of votes equal to the number of shares of common stock into which each preferred share is convertible at the time of such vote. The holders of the outstanding Series A and Series B Preferred Stock, voting together as a single class, are entitled to elect two directors to the Company's Board of Directors. Certain actions undertaken by the Company require approval from 75% of the holders of the outstanding Series A Preferred Stock and 60% of the Series B Preferred Stock. These actions include a liquidation, dissolution or winding up of the Company, certain amendments to the certificate of incorporation, altering the terms of the existing preferred stock and increasing the number of authorized shares of preferred stock.

Dividends

The Company shall not declare, pay or set aside any dividends unless the holders of each series of convertible preferred stock then outstanding shall receive first, or simultaneously, in the case of a dividend on common stock, on a pari passu basis, a dividend in an amount that is at least equal to the amount that would have been received by the holders of the Series A and Series B Preferred Stock had all the Series A and Series B Preferred Stock been converted to common stock. In the event of a dividend on a class of stock that is not convertible to common stock, the holders shall receive a dividend in proportion to that received by the other classes of stock.

Liquidation preference

In the event of any liquidation, dissolution, winding up of the affairs or deemed liquidation event of the Company, the holders of the then-outstanding Series A and Series B Preferred Stock are entitled to receive, on a pari passu basis, in preference to the common stock holders, an amount equal to the greater of (1) $1.00 per share of Series A Preferred Stock and $1.81 per share of Series B Preferred Stock, plus all declared but unpaid dividends, or (2) such amount per share of Series A Preferred Stock and Series B Preferred Stock payable as if converted into common stock. Any remaining assets of the Company shall be distributed ratably among the holders of common stock. If the assets or surplus funds to be distributed to the holders of the Series A and Series B Preferred Stock are insufficient to permit the payment to such holders of their full preferential amount, the assets and surplus funds legally available for distribution shall be distributed ratably among the holders of the Series A and Series B Preferred Stock, pro rata, based upon the number of shares held.

In the event of certain deemed liquidation events, holders of the Series A and Series B Preferred Stock may require the Company to redeem their shares at a price equal to the liquidation amount at that time.

Conversion

Each share of Series A and Series B Preferred Stock, at the option of the holder, is convertible into a number of fully paid shares of common stock as determined by dividing $1.00 for the Series A Preferred Stock and $1.81 for the Series B Preferred Stock, by the conversion price in effect at the time. The conversion price of Series A Preferred Stock and Series B Preferred Stock is $4.28 and $7.74 per share, respectively, as of December 31, 2014. The conversion price is subject to adjustment in accordance with provisions contained in the Company's certificate of incorporation. Conversion is automatic immediately upon the closing of a firm commitment underwritten public offering in which shares are sold to the public at a price of at least $8.57 per share (subject to appropriate adjustment for stock splits, stock dividends, combinations and other similar recapitalizations affecting the number of such shares issued and outstanding) for gross proceeds of at least $40,000,000, or upon the written election of 1) the holders of at least 75% of the then-outstanding shares of Series A Preferred Stock and 2) the holders of at least 60% of the then-outstanding shares of Series B Preferred Stock.

The Company evaluated the Series A Preferred Stock and Series B Preferred Stock and determined both should be considered "equity hosts" and not "debt hosts" as defined by ASC 815, Derivatives and Hedging. These evaluations are necessary in order to determine if any embedded features of the Series A Preferred Stock or Series B Preferred Stock require bifurcation and, therefore, separate accounting as derivative liabilities. The Company's analyses followed the "whole instrument approach," which compares the individual features against the entire preferred stock instruments which include those features. The Company's analyses were based on consideration of the Series A Preferred Stock and Series B Preferred Stock's economic characteristics and risks, and more specifically, evaluated all the stated and implied substantive terms and features, including (i) whether the Series A Preferred Stock or Series B Preferred Stock included redemption or put features, (ii) whether the preferred stockholders were entitled to dividends, (iii) the voting rights of the Series A Preferred Stock and Series B Preferred Stock and (iv) the existence and nature of any conversion rights. As a result of the Company's determination that the Series A Preferred Stock and Series B Preferred Stock are "equity hosts," the embedded conversion features do not require bifurcation as derivative liabilities. In addition, as the contingent put features described above contain gross settlement provisions, these features also do not require bifurcation as derivative liabilities.