Going Concern	6 Months Ended
Jun. 30, 2017
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Going Concern	4. Going Concern In accordance with Accounting Standards Codification (“ASC”) 205-40, Going Concern, the Company has evaluated whether there are conditions and events, considered in the aggregate, that raise substantial doubt about the Company’s ability to continue as a going concern within one year after the date that the condensed consolidated financial statements are issued. As of December 31, 2016, the Company had $21.5 million in unrestricted cash and cash equivalents, had suffered recurring losses from operations and had negative working capital and cash outflows from operating activities. Based on the evaluation completed in connection with the filing of the Company’s Annual Report on Form 10-K for the year ended December 31, 2016, including consideration of management’s plans, the Company previously concluded that there was substantial doubt as to its ability to continue as a going concern within one year after March 1, 2017, the date that the consolidated financial statements were issued. On April 3, 2017, the Company closed the Asset Sale with Ipsen and received a $575.0 million upfront cash payment, subject to a working capital adjustment. The working capital adjustment is currently estimated as a $2.2 million receivable expected to be received in the third quarter of 2017. The Company used a portion of the cash payment to redeem the $175.0 million outstanding aggregate principal amount of the 2022 Notes, which also required an additional make-whole premium payment of approximately $20.1 million, and deposited $60.0 million into an escrow account in response to a lawsuit filed by the trustee and certain holders of its 4.50% convertible notes due 2020 (the “Convertible Notes”). The Company distributed $140.0 million of the upfront cash payment in the form of a special cash dividend to stockholders, which was payable on May 26, 2017 to stockholders of record as of the close of business on May 17, 2017. After consideration of the Company’s cash and cash equivalents balance at March 31, 2017 of $17.2 million and the net proceeds from the Asset Sale, the Company has concluded that the previous conditions and events that raised substantial doubt about its ability to continue as a going concern have been alleviated. The Company updated its going concern assessment for the three months ended June 30, 2017 and concluded the Company is able to continue as a going concern within one year after the date that the condensed consolidated financial statements are issued.

4. Going Concern

In accordance with Accounting Standards Codification (“ASC”) 205-40, Going Concern, the Company has evaluated whether there are conditions and events, considered in the aggregate, that raise substantial doubt about the Company’s ability to continue as a going concern within one year after the date that the condensed consolidated financial statements are issued.

As of December 31, 2016, the Company had $21.5 million in unrestricted cash and cash equivalents, had suffered recurring losses from operations and had negative working capital and cash outflows from operating activities. Based on the evaluation completed in connection with the filing of the Company’s Annual Report on Form 10-K for the year ended December 31, 2016, including consideration of management’s plans, the Company previously concluded that there was substantial doubt as to its ability to continue as a going concern within one year after March 1, 2017, the date that the consolidated financial statements were issued.

On April 3, 2017, the Company closed the Asset Sale with Ipsen and received a $575.0 million upfront cash payment, subject to a working capital adjustment. The working capital adjustment is currently estimated as a $2.2 million receivable expected to be received in the third quarter of 2017. The Company used a portion of the cash payment to redeem the $175.0 million outstanding aggregate principal amount of the 2022 Notes, which also required an additional make-whole premium payment of approximately $20.1 million, and deposited $60.0 million into an escrow account in response to a lawsuit filed by the trustee and certain holders of its 4.50% convertible notes due 2020 (the “Convertible Notes”). The Company distributed $140.0 million of the upfront cash payment in the form of a special cash dividend to stockholders, which was payable on May 26, 2017 to stockholders of record as of the close of business on May 17, 2017. After consideration of the Company’s cash and cash equivalents balance at March 31, 2017 of $17.2 million and the net proceeds from the Asset Sale, the Company has concluded that the previous conditions and events that raised substantial doubt about its ability to continue as a going concern have been alleviated. The Company updated its going concern assessment for the three months ended June 30, 2017 and concluded the Company is able to continue as a going concern within one year after the date that the condensed consolidated financial statements are issued.