License Agreement with Roche	6 Months Ended
Jun. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
License Agreement with Roche	License Agreement with Roche The Company has determined that the License Agreement with Roche contains four units of accounting. The Company recognizes arrangement consideration allocated to each unit of accounting when all of the revenue recognition criteria in Accounting Standards Codification ("ASC") Topic 605-25, Revenue Recognition-Multiple-Element Arrangements (“ASC 605-25”) are satisfied for that particular unit of accounting. As of June 30, 2017, the basic revenue recognition criteria has been met for all units of accounting. Accordingly, the Company recognized $0.4 million in revenue related to the License Agreement for the six months ended June 30, 2017 allocated to the transfer of pre-clinical inventory. No revenue was recognized during the three months ended June 30, 2017. The Company determined that the milestone payments under the License Agreement were not subject to ASC Topic 605-28 because the achievement of the milestone event depends solely on Roche’s performance. The Company will recognize royalty revenue in the period of sale of the related product(s), based on the underlying contract terms, provided that the reported sales are reliably measurable and the Company has no remaining performance obligations, assuming all other revenue recognition criteria are met.

License Agreement with Roche

The Company has determined that the License Agreement with Roche contains four units of accounting. The Company recognizes arrangement consideration allocated to each unit of accounting when all of the revenue recognition criteria in Accounting Standards Codification ("ASC") Topic 605-25, Revenue Recognition-Multiple-Element Arrangements (“ASC 605-25”) are satisfied for that particular unit of accounting. As of June 30, 2017, the basic revenue recognition criteria has been met for all units of accounting. Accordingly, the Company recognized $0.4 million in revenue related to the License Agreement for the six months ended June 30, 2017 allocated to the transfer of pre-clinical inventory. No revenue was recognized during the three months ended June 30, 2017.

The Company determined that the milestone payments under the License Agreement were not subject to ASC Topic 605-28 because the achievement of the milestone event depends solely on Roche’s performance. The Company will recognize royalty revenue in the period of sale of the related product(s), based on the underlying contract terms, provided that the reported sales are reliably measurable and the Company has no remaining performance obligations, assuming all other revenue recognition criteria are met.