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CONSOLIDATED STATEMENTS OF CASH FLOWS DATA (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Supplemental Operating Activities:
Issuance of common stock for services rendered to date or to be received in future periods		$ 69	$ 41
Issuance of common stock for acquired in-process research technology			27,500
Issuance of common stock for 401(k) matching contributions and year-end bonuses	839	1,361	3,778
Reclassification between deposits and other current assets	219	526	(180)
Supplemental Investing Activities:
Net unrealized (loss) gain on available-for-sale securities	(54)	(38)	6
Supplemental cash flow information
Cash payments for taxes	$ 0	$ 0	$ 0

X

- Definition

Represents the amount of deposits that are expected to be returned within one year and are therefore reclassified to other current assets.

+ References

No definition available.

+ Details

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X

- Definition

Gross fair value of stock issued during the period to employee defined contribution plan and as a result of payment of employee year end bonuses in equity.

+ References

No definition available.

+ Details

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X

- Definition

Value of shares of stock issued during the period as part of a transaction to acquire research and development assets that do not qualify as a business combination.

+ References

No definition available.

+ Details

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- Definition

This item represents the pretax change in net unrealized holding gain (loss) on available-for-sale securities that has been included in accumulated other comprehensive income, a separate component of shareholders' equity, during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 9

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563

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- Definition

The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 25

-Subparagraph (f)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585

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- Definition

Value of stock issued in lieu of cash for services contributed to the entity. Value of the stock issued includes, but is not limited to, services contributed by vendors and founders.

+ References

No definition available.

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