Commitments and Contingencies	9 Months Ended
Sep. 30, 2015
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	6. Commitments and Contingencies Leases The Company leases its office and research and development facility in Berkeley, California, under a non-cancelable operating lease. In February 2015, the Company amended its office lease agreement to increase the total square footage to approximately 25,000 square feet and extended the term of the lease to expire on December 31, 2018. The lease also contains an option to extend the lease for an additional two years. Rent expense was $0.2 million and $0.1 million during the three months ended September 30, 2015 and 2014, respectively and was $0.4 million and $0.2 million for the nine months ended September 30, 2015 and 2014, respectively. In September 2015, the Company entered into an Office/Laboratory Lease, or the Lease, for approximately 56,452 square feet of office and laboratory space at a new facility located in Berkeley, California, or the Facility. The term of the Lease commences when the landlord delivers possession of the Facility to the Company. Upon commencement, the Lease has an initial term of twelve years. The Company has the option to extend the Lease beyond the Initial Term for up to two renewal terms of five years each, provided that the rental rate would be subject to market adjustment at the beginning of each renewal term. The Company also has a one-time option that may be exercised any time prior to July 1, 2016 to lease additional space within the Facility of approximately 25,600 square feet commencing January 1, 2017 and approximately 28,801 square feet commencing January 1, 2018. Indemnifications In the ordinary course of business, the Company enters into agreements that may include indemnification provisions. Pursuant to such agreements, the Company may indemnify, hold harmless and defend an indemnified party for losses suffered or incurred by the indemnified party. Some of the provisions will limit losses to those arising from third party actions. In some cases, the indemnification will continue after the termination of the agreement. The maximum potential amount of future payments the Company could be required to make under these provisions is not determinable. The Company has never incurred material costs to defend lawsuits or settle claims related to these indemnification provisions. The Company has also entered into indemnification agreements with its directors, officers and key employees that may require the Company to indemnify such individuals against liabilities that may arise by reason of their status or service as directors, officers or key employees to the fullest extent permitted by Delaware corporate law. The Company currently has directors’ and officers’ insurance. Legal During the normal course of business, the Company may be a party to legal claims that may not be covered by insurance. Management does not believe that any such claims would have a material impact on the Company’s financial statements. Other Commitments The Company has various manufacturing, clinical, research and other contracts with vendors in the conduct of the normal course of its business. All contracts are terminable, with varying provisions regarding termination. If a contract with a specific vendor were to be terminated, the Company would only be obligated for the products or services that the Company had received at the time the termination became effective as well as non-cancelable and non-refundable payment obligations incurred by the vendor for products or services before the termination became effective. In the case of terminating a clinical trial agreement at a particular site, the Company would also be obligated to provide continued support for appropriate medical procedures at that site until completion or termination.

6. Commitments and Contingencies

Leases

The Company leases its office and research and development facility in Berkeley, California, under a non-cancelable operating lease. In February 2015, the Company amended its office lease agreement to increase the total square footage to approximately 25,000 square feet and extended the term of the lease to expire on December 31, 2018. The lease also contains an option to extend the lease for an additional two years. Rent expense was $0.2 million and $0.1 million during the three months ended September 30, 2015 and 2014, respectively and was $0.4 million and $0.2 million for the nine months ended September 30, 2015 and 2014, respectively.

In September 2015, the Company entered into an Office/Laboratory Lease, or the Lease, for approximately 56,452 square feet of office and laboratory space at a new facility located in Berkeley, California, or the Facility. The term of the Lease commences when the landlord delivers possession of the Facility to the Company. Upon commencement, the Lease has an initial term of twelve years.

The Company has the option to extend the Lease beyond the Initial Term for up to two renewal terms of five years each, provided that the rental rate would be subject to market adjustment at the beginning of each renewal term. The Company also has a one-time option that may be exercised any time prior to July 1, 2016 to lease additional space within the Facility of approximately 25,600 square feet commencing January 1, 2017 and approximately 28,801 square feet commencing January 1, 2018.

Indemnifications

In the ordinary course of business, the Company enters into agreements that may include indemnification provisions. Pursuant to such agreements, the Company may indemnify, hold harmless and defend an indemnified party for losses suffered or incurred by the indemnified party. Some of the provisions will limit losses to those arising from third party actions. In some cases, the indemnification will continue after the termination of the agreement. The maximum potential amount of future payments the Company could be required to make under these provisions is not determinable. The Company has never incurred material costs to defend lawsuits or settle claims related to these indemnification provisions. The Company has also entered into indemnification agreements with its directors, officers and key employees that may require the Company to indemnify such individuals against liabilities that may arise by reason of their status or service as directors, officers or key employees to the fullest extent permitted by Delaware corporate law. The Company currently has directors’ and officers’ insurance.

Legal

During the normal course of business, the Company may be a party to legal claims that may not be covered by insurance. Management does not believe that any such claims would have a material impact on the Company’s financial statements.

Other Commitments

The Company has various manufacturing, clinical, research and other contracts with vendors in the conduct of the normal course of its business. All contracts are terminable, with varying provisions regarding termination. If a contract with a specific vendor were to be terminated, the Company would only be obligated for the products or services that the Company had received at the time the termination became effective as well as non-cancelable and non-refundable payment obligations incurred by the vendor for products or services before the termination became effective. In the case of terminating a clinical trial agreement at a particular site, the Company would also be obligated to provide continued support for appropriate medical procedures at that site until completion or termination.