Common Stock (Common Stock [Member])

12 Months Ended

Dec. 31, 2012

Common Stock [Member]

Class of Stock [Line Items]

Common Stock

Common Stock

As of December 31, 2012 and 2011, the Company was authorized to issue 100 million shares of $0.001 par value common stock. Reserved shares of common stock were as follows (in thousands):

	December 31,
	2012	2011
Warrants	17	17
Options	3,655	4,684
Restricted stock units	421	137
Total outstanding	4,093	4,838

Repurchase of Common Stock

During the year ended December 31, 2010, certain individuals, including current employees, former employees, and former directors, entered into binding agreements to sell common stock held by them to one of various accredited investors. During the year ended December 31, 2010, the Company exercised its right of first refusal for an additional 0.4 million shares at contracted prices ranging from $6.42 to $11.43 for an aggregate purchase price of $3.5 million. The shares repurchased were subsequently retired. In connection with the retirement of these shares, $2.6 million, representing the difference between the repurchase price and the average original issuance price of the retired shares was recorded to accumulated deficit.

Common Stock Warrants

Upon the consummation of the IPO in February 2011, the preferred stock warrant was automatically converted to a warrant to purchase shares of common stock in accordance with the terms of the warrant agreement and the warrant was reclassified to stockholders’ equity. As of December 31, 2012, there were 17 common stock warrants outstanding at an exercise price of $6.29.