Subsequent Events	6 Months Ended
Jun. 30, 2015
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events In June 2015, the Company filed an amendment to its Fifth Amended and Restated Certificate of Incorporation to effect a reverse stock split of the Company’s common stock at a ratio of 1-for-8, and a change in the number of authorized shares of the Company’s common stock to 50,000,000 shares, which was approved by the Company's shareholders at the annual meeting held on June 18, 2015. The reverse stock split and change in authorized shares became effective July 1, 2015. Accordingly, all historical per share information presented in these consolidated financial statements as been adjusted to reflect the effect of the reverse stock split and change to authorized shares of common stock. On July 20, 2015, the Company entered into an amended lease with Emery Station Joint Venture, LLC. The lease amendment extends the term of the original lease to November 30, 2022 and adds 9,916 rentable square feet to the existing 12,118 rentable square feet currently leased by the Company in Emeryville, California. The amendment also contains an option for the Company to expand its space leased from the landlord under certain conditions, as well as a renewal option for an additional five year term upon the expiration date. The lease amendment was effective as of July 16, 2015, and the landlord will deliver possession of the additional space leased within 45 days of the effective date. Prior to October 1, 2015, the base rent for the Company’s existing leased premises remains unchanged from the previous agreement. Following October 1, 2015, the base rent for the existing leased premises will be $39,384 per month. The base rent for the additional premises leased will be $32,227 per month, and the rent for the new premises will be abated for 60 days following the earlier of (a) the date the Company occupies the new premises for the purpose of conducting business and (b) the latter of (i) 21 days after the landlord delivers the new premises and (ii) October 1, 2015. The base rent for both the existing leased premises and additional leased premises will increase 3% on a yearly basis throughout the term, and the Company will pay a portion of common area and pass-through expenses in excess of base year amounts. In August 2015, the Company completed a public offering of 5,462,500 shares of its common stock at a public offering price of $18.00 per share, including the over-allotment provision granted to the underwriters of 712,500 shares. The shares were registered pursuant to a registration statement on Form S-3 filed on November 6, 2014. The Company received net proceeds of approximately $92,000,000, after deducting underwriting discounts and commissions and estimated offering-related transaction costs.

Subsequent Events

In June 2015, the Company filed an amendment to its Fifth Amended and Restated Certificate of Incorporation to effect a reverse stock split of the Company’s common stock at a ratio of 1-for-8, and a change in the number of authorized shares of the Company’s common stock to 50,000,000 shares, which was approved by the Company's shareholders at the annual meeting held on June 18, 2015. The reverse stock split and change in authorized shares became effective July 1, 2015. Accordingly, all historical per share information presented in these consolidated financial statements as been adjusted to reflect the effect of the reverse stock split and change to authorized shares of common stock.

On July 20, 2015, the Company entered into an amended lease with Emery Station Joint Venture, LLC. The lease amendment extends the term of the original lease to November 30, 2022 and adds 9,916 rentable square feet to the existing 12,118 rentable square feet currently leased by the Company in Emeryville, California. The amendment also contains an option for the Company to expand its space leased from the landlord under certain conditions, as well as a renewal option for an additional five year term upon the expiration date. The lease amendment was effective as of July 16, 2015, and the landlord will deliver possession of the additional space leased within 45 days of the effective date. Prior to October 1, 2015, the base rent for the Company’s existing leased premises remains unchanged from the previous agreement. Following October 1, 2015, the base rent for the existing leased premises will be $39,384 per month. The base rent for the additional premises leased will be $32,227 per month, and the rent for the new premises will be abated for 60 days following the earlier of (a) the date the Company occupies the new premises for the purpose of conducting business and (b) the latter of (i) 21 days after the landlord delivers the new premises and (ii) October 1, 2015. The base rent for both the existing leased premises and additional leased premises will increase 3% on a yearly basis throughout the term, and the Company will pay a portion of common area and pass-through expenses in excess of base year amounts.

In August 2015, the Company completed a public offering of 5,462,500 shares of its common stock at a public offering price of $18.00 per share, including the over-allotment provision granted to the underwriters of 712,500 shares. The shares were registered pursuant to a registration statement on Form S-3 filed on November 6, 2014. The Company received net proceeds of approximately $92,000,000, after deducting underwriting discounts and commissions and estimated offering-related transaction costs.