Lease Incentive	12 Months Ended
Dec. 31, 2014
Text Block [Abstract]
Lease Incentive	7. Lease Incentive On August 1, 2013, the Company and Legacy Partners I Alameda, LLC entered into the fifth amendment to the Company’s lease, dated September 1, 1996, which covers the Company’s space at 965 Atlantic Avenue and 2020 Challenger Drive, in Alameda, California. Under the terms of the amendment, the term of the Company’s lease was extended until December 2020 and the Company was eligible to receive up to $1.3 million from Legacy Partners for leasehold improvements for both buildings. For the years ended December 31, 2014 and 2013, the Company incurred $0.2 million and $1.1 million, respectively, for leasehold improvements under the terms of the amendment for both buildings. The lease incentives were recognized as reductions of rental expense on a straight-line basis over the term of the lease. As of December 31, 2013, the leasehold improvements had not placed in service and were recorded as Construction in Progress, see Note 5, “Property and Equipment, net.” The leasehold improvements were placed in service during the first quarter of 2014 and amortized over the life of the lease or their estimated useful lives, whichever is shorter, using the straight-line method. As of December 31, 2014, $0.9 million of the lease incentives were classified as long-term and $0.2 million were classified as current in the Company’s Consolidated Balance Sheets. As of December 31, 2013, the reimbursement of $1.1 million from Legacy Partners was recorded as Other receivables in the Company’s Consolidated Balance Sheets. As of December 31, 2014, there was no remaining reimbursement receivable from Legacy Partners.

7. Lease Incentive

On August 1, 2013, the Company and Legacy Partners I Alameda, LLC entered into the fifth amendment to the Company’s lease, dated September 1, 1996, which covers the Company’s space at 965 Atlantic Avenue and 2020 Challenger Drive, in Alameda, California. Under the terms of the amendment, the term of the Company’s lease was extended until December 2020 and the Company was eligible to receive up to $1.3 million from Legacy Partners for leasehold improvements for both buildings.

For the years ended December 31, 2014 and 2013, the Company incurred $0.2 million and $1.1 million, respectively, for leasehold improvements under the terms of the amendment for both buildings. The lease incentives were recognized as reductions of rental expense on a straight-line basis over the term of the lease. As of December 31, 2013, the leasehold improvements had not placed in service and were recorded as Construction in Progress, see Note 5, “Property and Equipment, net.” The leasehold improvements were placed in service during the first quarter of 2014 and amortized over the life of the lease or their estimated useful lives, whichever is shorter, using the straight-line method. As of December 31, 2014, $0.9 million of the lease incentives were classified as long-term and $0.2 million were classified as current in the Company’s Consolidated Balance Sheets. As of December 31, 2013, the reimbursement of $1.1 million from Legacy Partners was recorded as Other receivables in the Company’s Consolidated Balance Sheets. As of December 31, 2014, there was no remaining reimbursement receivable from Legacy Partners.