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Contractual Revenue
12 Months Ended
Dec. 31, 2018
Contractual Revenue [Abstract]  
Contractual Revenue

NOTE 3. CONTRACTUAL REVENUE

In September 2013, we entered into a development, commercialization and license agreement with F. Hoffman-La Roche Ltd. (“Roche Agreement”), 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, of which $12.1 million was recognized in 2016. Roche terminated this agreement in December 2016 and no further payments are expected to be received and no additional revenue was recognized.