Convertible Preferred Stock and Stockholders' Deficit (Tables)

12 Months Ended

Dec. 31, 2012

As of December 31, 2011, convertible preferred stock balances were as follows:


	Shares Authorized		Shares Issued and Outstanding		Carrying Value		Liquidation Amount
					(In thousands)		(In thousands)
Series A		1,527,611		428,922	$	1,835	$	2,200
Series B-1		3,425,152		961,720		4,726		4,932
Series B-2		14,811,323		4,119,759		21,039		21,128
Series C		6,944,450		1,949,874		19,905		20,000
Series D		12,400,000		3,196,755		35,673		37,002

		39,108,536		10,657,030	$	83,178	$	85,262

As of December 31, 2012, convertible preferred stock balances were as follows:


	Shares Authorized		Shares Issued and Outstanding		Carrying Value		Liquidation Amount
					(In thousands)		(In thousands)
Series A		1,527,611		428,922	$	1,835	$	2,200
Series B-1		3,425,152		961,720		4,726		4,932
Series B-2		14,811,323		4,119,759		21,039		21,128
Series C		6,944,450		1,949,874		19,905		20,000
Series D		11,385,196		3,196,755		35,673		37,002
Series E		22,058,823		1,672,300		18,845		20,250

		60,152,555		12,329,330	$	102,023	$	105,512

Shares of Common Stock Reserved for Issuance

The Company had reserved the following shares of common stock for issuance as of December 31, 2012


Conversion of Series A Preferred			428,922
Conversion of Series B-1 Preferred			961,720
Conversion of Series B-2 Preferred			4,119,759
Exercise and conversion of Series B-2 and Series E Preferred warrants			72,029
Conversion of Series C Preferred			1,949,874
Conversion of Series D Preferred			3,196,755
Conversion of Series E Preferred			1,672,300
Common stock available for grant of stock awards			2,129,055
Common stock options outstanding			1,030,795

			15,561,209

Activity Under 2012 Plan

Activity under the Company’s stock plans is as follows:


	Shares Available for Grant			Number of Shares Subject to Options Outstanding			Weighted- Average Exercise Price
Balances at December 31, 2009		522,497			1,040,658		$	1.00
Stock awards granted		(134,530	)		—
Options granted		(145,375	)		145,375			1.46
Options canceled		76,098			(76,098	)		1.07
Options exercised		—			(147,154	)		0.82

Balances at December 31, 2010		318,690			962,781			1.07
Additional shares authorized		912,544			—
Stock awards granted		(72,441	)		—
Options granted		(324,585	)		324,585			1.46
Options canceled		165,980			(165,980	)		1.25
Options exercised		—			(35,087	)		0.96
Stock awards canceled and forfeited		11,462			—

Balances at December 31, 2011		1,011,650			1,086,299			1.18
Additional shares authorized		1,123,131			—
Options granted		(444,607	)		444,607			4.77
Options canceled		421,987			(421,987	)		1.26
Options exercised		—			(78,124	)		1.08
Stock awards canceled and forfeited		16,894			—

Balances at December 31, 2012		2,129,055			1,030,795			2.68
Options vested and expected to vest at December 31, 2012					979,255			2.68

Additional Information Regarding Options Outstanding

Additional information regarding options outstanding as of December 31, 2012 is as follows:


	Options Outstanding and Exercisable
Exercise Price	Number of Shares Outstanding		Weighted- Average Remaining Contractual Life (In Years)
$0.50		37,240		2.28
0.53		45,625		4.02
0.89		15,723		4.54
1.03		182,754		5.31
1.21		177,387		6.13
1.46		128,020		7.75
2.17		66,394		9.19
4.74		349,574		9.58
11.36		28,078		9.81

		1,030,795

Employee And Director Stock Options Granted under 2001 Plan, Assumption Used In Black-Scholes Model

The fair value-based measurement of employee and director stock options granted under the Company’s stock plans was estimated at the date of grant using the Black-Scholes model with the following assumptions:


	Year Ended December 31,
	2012	2011	2010
Expected term	6 years	6 years	6 years
Expected volatility	57-59%	58-60%	87-88%
Risk-free interest rate	0.8-1.4%	1.9-2.7%	1.5-2.9%
Expected dividend yield	0%	0%	0%

Total Employee And Director Stock-Based Compensation Expense

Total employee and director stock-based compensation expense recognized was as follows:


	Years Ended December 31,
(In thousands)	2012		2011		2010
General and administrative	$	423	$	93	$	152
Research and development		398		128		147

	$	821	$	221	$	299

- Definition

Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed.

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- Definition

Tabular disclosure of preferred units of master limited partnerships that have priority over limited partner units in areas including liquidation, redemption, conversion, tax status of distribution or sharing in distributions. This schedule ordinarily includes a description of the preferred units that details various rights including redemption, conversion, liquidation, and sharing in distributions; capital contributed by preferred partners; number of preferred units authorized to be issued, issued, and outstanding; aggregate cumulative cash distributions made to the preferred partners; aggregate cumulative net income earned by the preferred partners; capital account balance of the preferred partners.

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- Definition

Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms.

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