Subsequent Events (Details) - $ / shares

1 Months Ended

Apr. 17, 2017

Mar. 31, 2017

Dec. 31, 2016

Subsequent Events (Textual)

Common stock, par value

$ 0.0001

$ 0.0001

Subsequent Event [Member]

Subsequent Events (Textual)

Aggregate shares of common stock

97,866,510

Common stock, par value

$ 0.0001

Common stock issued and outstanding percentage

87.00%

Additional shares of common shares, Description

The holders of NextDecade Membership Interests and the owners of the Blocker Membership Interests shall be entitled to receive an additional 4,893,326 shares (up to 19,573,304 shares in the aggregate) of Harmony common stock.

Liquefied natural gas, Description

● NextDecade or one or more subsidiaries of the foregoing receiving the Final Environment Impact Statement issued by the Federal Energy Regulatory Commission by June 30, 2018;

● The execution by NextDecade or one or more subsidiaries of the foregoing of a binding sale and purchase or tolling agreement (with customary conditions precedent) for the sale and purchase of, or the provision of tolling services with respect to, at least 1 million tons of liquefied natural gas per annum by June 30, 2018;

● The execution by NextDecade or one or more subsidiaries of the foregoing of an engineering procurement and construction contract (with customary conditions precedent) for the construction of the Rio Grande LNG export terminal by December 31, 2018; and

● An affirmative vote of the board of directors of Harmony to make a final investment decision for the Rio Grande LNG or Rio Bravo Pipeline projects by June 30, 2019.

Aggregate common shares percentage

3.00%

Subsequent Event [Member] | Stockholders [Member]

Subsequent Events (Textual)

Common stock issued and outstanding percentage

13.00%