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Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2012

Assets and Liabilities Measured at Fair Value on a Recurring Basis


	Fair Value Measurements at Reporting Date Using
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
At September 30, 2012
Assets
Money market fund shares⁽¹⁾	$	45,592		0		0	$	45,592

Liabilities
Common stock warrant liabilities⁽²⁾	$	0		0		24,915	$	24,915
Embedded derivative liabilities⁽³⁾	$	0		0		679	$	679

At December 31, 2011
Assets
Money market fund shares⁽¹⁾	$	49,752		0		0	$	49,752

Liabilities
Common stock warrant liability⁽⁴⁾	$	0		0		345	$	345
Embedded derivative liabilities⁽³⁾	$	0		0		845	$	845

Reconciliation of Liabilities Measured at Fair Value Using Significant Observable Inputs (Level 3)

The following table provides a reconciliation of liabilities measured at fair value using significant observable inputs (Level 3) for the nine months ended September 30, 2012 (in thousands):


	Common Stock Warrant Liabilities		Embedded Derivative Liabilities
Balance at December 31, 2011	$	345	$	845
Issuance of common stock warrants		20,959		0
Changes in fair value		3,611		(166	)

Balance at September 30, 2012	$	24,915	$	679

Basic and Diluted Net Loss Per Share

The following table presents the computation of basic and diluted net loss per share (in thousands, except per share amounts):


	Three Months Ended September 30,						Nine Months Ended September 30,
	2012			2011			2012			2011
Numerator
Net loss	$	(19,282	)	$	(22,038	)	$	(46,743	)	$	(60,199	)
Denominator
Weighted average common shares outstanding		90,370			37,320			73,790			35,132
Weighted average shares subject to repurchase		0			0			0			(5	)

Weighted average shares outstanding, basic and diluted		90,370			37,320			73,790			35,127

Basic and diluted net loss per share	$	(0.21	)	$	(0.59	)	$	(0.63	)	$	(1.71	)

Schedule of Calculation of Diluted Net Loss Per Share

The following table presents potentially dilutive securities not included in the calculation of diluted net loss per share because to do so would be anti-dilutive (in thousands, of common equivalent shares):


	Three and Nine Months Ended September 30,
	2012		2011
Common stock warrants		16,285		508
Common stock options and restricted stock units		9,476		3,441

		25,761		3,949

- Definition

Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

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- Definition

Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability.

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