Contractual Revenue	6 Months Ended
Jun. 30, 2017
Contractual Revenue [Abstract]
Contractual Revenue	NOTE 3. CONTRACTUAL REVENUE In September 2013, we entered into the “Roche Agreement” with Roche, pursuant to which we accounted for, and recognized as revenue, the up-front payment received thereunder using the proportional performance method over the periods in which the delivery of elements pursuant to the Roche Agreement occurs. We recognized revenue under the Roche Agreement using a straight-line convention over the service periods of the deliverables as this method approximated our performance of services pursuant to the Roche Agreement. Out of the $35.0 million upfront cash payment received, quarterly amortization of $1.7 million was recognized as contractual revenue from the fourth quarter of 2013 to the fourth quarter of 2014. Beginning in the three-month period ended March 31, 2015, we revised the estimated development period related to our contractual revenue amortization based on increasing certainty of the development time on a prospective approach and quarterly amortization of $3.6 million was recognized as contractual revenue for each of the four quarters of 2015 and for each of the first three quarters of 2016. As of September 30, 2016, the total deferred contractual revenue balance was $1.3 million, relating to the amount allocated to the deliverable of our participation on the joint steering committee. In December 2016, we received notice from Roche that Roche had elected to terminate the Roche Agreement for convenience and the termination became effective February 10, 2017, which was 60 days after the date of the notice in accordance with the terms of the Roche Agreement. Upon such notice in December 2016, no further participation on the joint steering committee was deemed necessary; as such, we recognized the entire remaining unamortized deferred revenue of $1.3 million as contractual revenue in the fourth quarter of 2016. Further, the Roche Agreement provided for additional payments totaling $40.0 million upon the achievement of certain development milestones, all of which have previously been received and recognized as revenue. Consideration from development milestones is recognized in the period in which a milestone is achieved only if the milestone is considered substantive in its entirety. We achieved the first development milestone under the Roche Agreement and recognized the related $10.0 million as contractual revenue during the year ended December 31, 2014. We achieved the second and the third (final) development milestones under the Roche Agreement and recognized the related $10.0 million and $20.0 million as contractual revenue during the three-month periods ended June 30, 2015 and December 31, 2015, respectively. There are no other milestones remaining to be achieved.

NOTE 3. CONTRACTUAL REVENUE

In September 2013, we entered into the “Roche Agreement” with Roche, pursuant to which we accounted for, and recognized as revenue, the up-front payment received thereunder using the proportional performance method over the periods in which the delivery of elements pursuant to the Roche Agreement occurs. We recognized revenue under the Roche Agreement using a straight-line convention over the service periods of the deliverables as this method approximated our performance of services pursuant to the Roche Agreement. Out of the $35.0 million upfront cash payment received, quarterly amortization of $1.7 million was recognized as contractual revenue from the fourth quarter of 2013 to the fourth quarter of 2014. Beginning in the three-month period ended March 31, 2015, we revised the estimated development period related to our contractual revenue amortization based on increasing certainty of the development time on a prospective approach and quarterly amortization of $3.6 million was recognized as contractual revenue for each of the four quarters of 2015 and for each of the first three quarters of 2016. As of September 30, 2016, the total deferred contractual revenue balance was $1.3 million, relating to the amount allocated to the deliverable of our participation on the joint steering committee. In December 2016, we received notice from Roche that Roche had elected to terminate the Roche Agreement for convenience and the termination became effective February 10, 2017, which was 60 days after the date of the notice in accordance with the terms of the Roche Agreement. Upon such notice in December 2016, no further participation on the joint steering committee was deemed necessary; as such, we recognized the entire remaining unamortized deferred revenue of $1.3 million as contractual revenue in the fourth quarter of 2016.

Further, the Roche Agreement provided for additional payments totaling $40.0 million upon the achievement of certain development milestones, all of which have previously been received and recognized as revenue. Consideration from development milestones is recognized in the period in which a milestone is achieved only if the milestone is considered substantive in its entirety. We achieved the first development milestone under the Roche Agreement and recognized the related $10.0 million as contractual revenue during the year ended December 31, 2014. We achieved the second and the third (final) development milestones under the Roche Agreement and recognized the related $10.0 million and $20.0 million as contractual revenue during the three-month periods ended June 30, 2015 and December 31, 2015, respectively. There are no other milestones remaining to be achieved.