Commercial Supply Agreement	3 Months Ended
Mar. 31, 2016
Commitments And Contingencies Disclosure [Abstract]
Commercial Supply Agreement	6. Commercial Supply Agreement In July 2014, we entered into an agreement with CMC ICOS Biologics, Inc. (“CMC Biologics”), a subsidiary of CMC Biologics S.à.r.l., a privately-held contract manufacturing organization, pursuant to which CMC Biologics will manufacture clinical and commercial supply of andexanet alfa. Under the agreement, we are required to purchase an aggregate fixed number of batches of andexanet alfa from CMC Biologics beginning in 2015 through 2021. Total batch commitments under the agreement can be increased or decreased based on the achievement of milestones relating to the regulatory approval process for andexanet alfa, expansion of existing manufacturing capacity and operational qualification of CMC Biologics’ manufacturing facilities. We made an upfront payment to CMC Biologics in the amount of $10.0 million in July 2014 and a reservation payment to CMC Biologics of $4.6 million in November 2014. Both payments will be credited against our future purchases of batches under the agreement. Total fixed commitments under the agreement for the purchases of clinical and commercial batches, not taking into account possible price and batch adjustments per the terms of the agreement, are approximately $276.1 million. Payments made for purchases of batches since inception of this agreement as of March 31, 2016 amount to $40.7 million. The term of the agreement is seven years and may be early terminated by either party for the other party’s uncured material breach or insolvency. We may also terminate the agreement if CMC Biologics is unable to add additional manufacturing capacity on a timely basis, if certain manufacturing-related regulatory events do not occur before certain deadlines, or if the batch yield is below a certain threshold, in which case we are not obligated to pay CMC Biologics a termination payment and CMC Biologics will be obligated to refund the uncredited amounts of the upfront payment and reservation payment. In addition, we may terminate the agreement unilaterally if we discontinue the development and commercialization of andexanet alfa for regulatory, safety, efficacy or other commercial reasons, or if the projected market demand or gross margin of andexanet alfa is below a minimum threshold. The termination provisions will obligate us to pay CMC Biologics a termination fee between $5.0 million and $30.0 million, depending on the date of termination. The termination fee is highest from 2015 through 2017, and then decreases through 2021. Any remaining upfront payments or reservation payments we have made, not yet credited against the purchase of batches, at the time of termination will be applied against the termination fee. Under the consolidation guidance, we determined that CMC Biologics is and continues to be a VIE, but that we are not CMC Biologics’ primary beneficiary and therefore consolidation of CMC Biologics by us is not required. As of March 31, 2016, we have not provided financial, or other, support to CMC Biologics that was not previously contractually required. The upfront and reservation payment of $14.6 million is recorded as $10.6 million in prepaid and other long-term assets and $2.8 million in prepaid research and development in the condensed consolidated balance sheet, net of amortization as of March 31, 2016. The unamortized payments made for purchases of batches of $7.7 million are recorded in prepaid research and development in the condensed consolidated balance sheet as of March 31, 2016. These assets represent our maximum exposure to loss under this agreement at March 31, 2016. The upfront payment will be charged to research and development expense, prior to regulatory approval of andexanet alfa, as services are rendered or batches are delivered. Also, we have recorded an accrual for services rendered by CMC Biologics of $857,000 in accrued research and development in the condensed consolidated balance sheet as of March 31, 2016. We are currently not able to quantify the exposure to losses associated with the fixed pricing terms of this agreement.

6. Commercial Supply Agreement

In July 2014, we entered into an agreement with CMC ICOS Biologics, Inc. (“CMC Biologics”), a subsidiary of CMC Biologics S.à.r.l., a privately-held contract manufacturing organization, pursuant to which CMC Biologics will manufacture clinical and commercial supply of andexanet alfa.

Under the agreement, we are required to purchase an aggregate fixed number of batches of andexanet alfa from CMC Biologics beginning in 2015 through 2021. Total batch commitments under the agreement can be increased or decreased based on the achievement of milestones relating to the regulatory approval process for andexanet alfa, expansion of existing manufacturing capacity and operational qualification of CMC Biologics’ manufacturing facilities. We made an upfront payment to CMC Biologics in the amount of $10.0 million in July 2014 and a reservation payment to CMC Biologics of $4.6 million in November 2014. Both payments will be credited against our future purchases of batches under the agreement.

Total fixed commitments under the agreement for the purchases of clinical and commercial batches, not taking into account possible price and batch adjustments per the terms of the agreement, are approximately $276.1 million. Payments made for purchases of batches since inception of this agreement as of March 31, 2016 amount to $40.7 million.

The term of the agreement is seven years and may be early terminated by either party for the other party’s uncured material breach or insolvency. We may also terminate the agreement if CMC Biologics is unable to add additional manufacturing capacity on a timely basis, if certain manufacturing-related regulatory events do not occur before certain deadlines, or if the batch yield is below a certain threshold, in which case we are not obligated to pay CMC Biologics a termination payment and CMC Biologics will be obligated to refund the uncredited amounts of the upfront payment and reservation payment.

In addition, we may terminate the agreement unilaterally if we discontinue the development and commercialization of andexanet alfa for regulatory, safety, efficacy or other commercial reasons, or if the projected market demand or gross margin of andexanet alfa is below a minimum threshold. The termination provisions will obligate us to pay CMC Biologics a termination fee between $5.0 million and $30.0 million, depending on the date of termination. The termination fee is highest from 2015 through 2017, and then decreases through 2021. Any remaining upfront payments or reservation payments we have made, not yet credited against the purchase of batches, at the time of termination will be applied against the termination fee.

Under the consolidation guidance, we determined that CMC Biologics is and continues to be a VIE, but that we are not CMC Biologics’ primary beneficiary and therefore consolidation of CMC Biologics by us is not required.

As of March 31, 2016, we have not provided financial, or other, support to CMC Biologics that was not previously contractually required. The upfront and reservation payment of $14.6 million is recorded as $10.6 million in prepaid and other long-term assets and $2.8 million in prepaid research and development in the condensed consolidated balance sheet, net of amortization as of March 31, 2016. The unamortized payments made for purchases of batches of $7.7 million are recorded in prepaid research and development in the condensed consolidated balance sheet as of March 31, 2016. These assets represent our maximum exposure to loss under this agreement at March 31, 2016. The upfront payment will be charged to research and development expense, prior to regulatory approval of andexanet alfa, as services are rendered or batches are delivered. Also, we have recorded an accrual for services rendered by CMC Biologics of $857,000 in accrued research and development in the condensed consolidated balance sheet as of March 31, 2016. We are currently not able to quantify the exposure to losses associated with the fixed pricing terms of this agreement.