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Subsequent Event	12 Months Ended
	Dec. 31, 2014
Subsequent Events [Abstract]
Subsequent Event	13. Subsequent Event In January 2015, the Federal Trade Commission granted early termination of the waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976 with respect to the collaboration and license agreement with Janssen and the stock purchase agreement and investor agreement with JJDC (as described in Note 8). Accordingly, the Company issued 1,923,077 shares of common stock to JJDC and received $75.0 million from JJDC under the stock purchase agreement and received the $50.0 million upfront payment from Janssen under the collaboration and license agreement.

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- Definition

The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

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