Subsequent Events	9 Months Ended
Sep. 30, 2018
Subsequent Events [Abstract]
Subsequent Events	NOTE 10— SUBSEQUENT EVENTS On July 20, 2018, the Company entered into a Share Purchase Agreement (the “SPA”) with certain shareholders (the “Sellers”) of TxCell, and the Company and TxCell entered into a Tender Offer Agreement (the “TOA”). Pursuant to the SPA and the TOA, the Company expects to acquire 100% of the equity interests of TxCell for approximately €72 million, on a debt-free and cash-free basis. On October 1, 2018, pursuant to the SPA, the Company purchased all of the ordinary shares of TxCell the “Ordinary Shares”) held by the Sellers for €2.58 per share in cash (such per share price being the “Offer Price” and such purchase being the “Block Transaction”). The Sellers owned 13,519,036 Ordinary Shares, which represented approximately 53% of the share capital and voting rights of TxCell. Subsequent to the completion of the Block Transaction, as of November 7, 2018, we owned approximately 80% of the share capital and voting rights of TxCell. Promptly following the completion of the Block Transaction, the Company designated a number of directors on the board of directors of TxCell representing a majority of the TxCell board. Pursuant to the TOA, on November 1, 2018, the Company, commenced a cash tender offer (the “Offer”) to acquire all of the Ordinary Shares of TxCell not held by the Company for the Offer Price. In addition, the Company has agreed to: (a) grant to certain employees (including certain members of management) of TxCell stock options to purchase approximately 150,000 shares of Company common stock, which will be granted under the Company’s existing 2018 Equity Incentive Plan, with standard vesting conditions; and (b) enter into arrangements with holders of 495,396 “free shares” of TxCell, pursuant to which the Company would purchase such shares from the holders thereof from time to time through mid-2021. The purchase price for each such free share will be based on the performance of the Company’s stock price from the announcement of the transactions contemplated by the SPA and TOA (at which time each free share was valued at €2.58 per share through the time of purchase (such that, for example, if the Company’s stock price doubles during that time period, the value of each free share would similarly double). The Sellers and TxCell have made limited representations and warranties in the TOA as are customary for such an agreement governed under French law. The TOA also contains customary termination rights. If, following completion of the Offer, as it may be extended, the Company owns at least 95% of the share capital and voting rights of TxCell, it plans to acquire the remaining Ordinary Shares for the Offer Price through a compulsory squeeze-out procedure under French law. At this time, the Company is assessing the accounting impact of the agreement.

NOTE 10— SUBSEQUENT EVENTS

On July 20, 2018, the Company entered into a Share Purchase Agreement (the “SPA”) with certain shareholders (the “Sellers”) of TxCell, and the Company and TxCell entered into a Tender Offer Agreement (the “TOA”). Pursuant to the SPA and the TOA, the Company expects to acquire 100% of the equity interests of TxCell for approximately €72 million, on a debt-free and cash-free basis.

On October 1, 2018, pursuant to the SPA, the Company purchased all of the ordinary shares of TxCell the “Ordinary Shares”) held by the Sellers for €2.58 per share in cash (such per share price being the “Offer Price” and such purchase being the “Block Transaction”). The Sellers owned 13,519,036 Ordinary Shares, which represented approximately 53% of the share capital and voting rights of TxCell. Subsequent to the completion of the Block Transaction, as of November 7, 2018, we owned approximately 80% of the share capital and voting rights of TxCell.

Promptly following the completion of the Block Transaction, the Company designated a number of directors on the board of directors of TxCell representing a majority of the TxCell board.

Pursuant to the TOA, on November 1, 2018, the Company, commenced a cash tender offer (the “Offer”) to acquire all of the Ordinary Shares of TxCell not held by the Company for the Offer Price. In addition, the Company has agreed to: (a) grant to certain employees (including certain members of management) of TxCell stock options to purchase approximately 150,000 shares of Company common stock, which will be granted under the Company’s existing 2018 Equity Incentive Plan, with standard vesting conditions; and (b) enter into arrangements with holders of 495,396 “free shares” of TxCell, pursuant to which the Company would purchase such shares from the holders thereof from time to time through mid-2021. The purchase price for each such free share will be based on the performance of the Company’s stock price from the announcement of the transactions contemplated by the SPA and TOA (at which time each free share was valued at €2.58 per share through the time of purchase (such that, for example, if the Company’s stock price doubles during that time period, the value of each free share would similarly double).

The Sellers and TxCell have made limited representations and warranties in the TOA as are customary for such an agreement governed under French law. The TOA also contains customary termination rights.

If, following completion of the Offer, as it may be extended, the Company owns at least 95% of the share capital and voting rights of TxCell, it plans to acquire the remaining Ordinary Shares for the Offer Price through a compulsory squeeze-out procedure under French law. At this time, the Company is assessing the accounting impact of the agreement.