Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Statement of Cash Flows [Abstract]
Interest Paid	$ 551us-gaap_InterestPaid	$ 0us-gaap_InterestPaid
Cash flows from operating activities
Net loss	(17,239)us-gaap_NetIncomeLoss	(6,671)us-gaap_NetIncomeLoss
Adjustments to reconcile net loss to net cash used in operating activities
Depreciation	24us-gaap_Depreciation	15us-gaap_Depreciation
Amortization of deferred financing costs and debt discount	77	0
Amortization of discount on available-for-sale investments	163	56
Stock-based compensation	2,741us-gaap_ShareBasedCompensation	1,922us-gaap_ShareBasedCompensation
Changes in operating assets and liabilities
Prepaid, current and other assets	(205)	(27)
Accounts payable and other current liabilities	1,144	208
Interest payable	(12)	0
Net cash used in operating activities	(13,307)	(4,497)
Cash flows from investing activities
Purchase of available-for-sale investments	(8,188)	(29,345)
Maturity of available-for-sale investments	14,828	0
Purchase of furniture, fixtures and equipment	(539)	(29)
Net cash provided by (used in) investing activities	6,101	(29,374)
Cash flows from financing activities
Proceeds from sale of common stock	35,000	0
Proceeds from exercise of stock purchase rights	70	65
Net cash provided by financing activities	35,070	65
Net change in cash and cash equivalents	27,864	(33,806)
Beginning of period	85,586	69,649
End of period	$ 113,450	$ 35,843

Proceeds from exercise of stock purchase rights.

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The sum of the periodic adjustments of the differences between securities' face values and purchase prices that are charged against earnings. This is called accretion if the security was purchased at a discount and amortization if it was purchased at premium. As a noncash item, this element is an adjustment to net income when calculating cash provided by or used in operations using the indirect method.

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Amount of noncash expense included in interest expense to allocate debt discount and premium, and the costs to issue debt and obtain financing over the related debt instruments. Alternate captions include noncash interest expense.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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The increase (decrease) during the reporting period in the aggregate amount of obligations incurred but not paid and other operating obligations not separately disclosed in the statement of cash flows.

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The increase (decrease) during the reporting period in interest payable, which represents the amount owed to note holders, bond holders, and other parties for interest earned on loans or credit extended to the reporting entity.

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The increase (decrease) during the reporting period in the value of prepaid expenses and other assets not separately disclosed in the statement of cash flows, for example, deferred expenses, intangible assets, or income taxes.

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The amount of cash paid for interest during the period.

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Amount of cash inflow (outflow) of financing activities, excluding discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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Amount of cash inflow (outflow) of investing activities, excluding discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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Amount of cash inflow (outflow) from operating activities, excluding discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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The cash inflow from the additional capital contribution to the entity.

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The cash inflow associated with maturities (principal being due), prepayments and calls (requests of early payments) on securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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