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Stockholders' Equity
 12 Months Ended
Dec. 31, 2015
Equity [Abstract]  
Stockholders' Equity
Stockholders’ Equity
Treasury Stock
During the first quarter of 2015, 2.4 million shares of common stock held by the Company as treasury stock were determined to have been retired. The retirement of the shares had no effect on the number of shares authorized or outstanding or on total stockholders’ equity.
Preferred Stock
The Company has a total of 2,000,000 shares of Series A and Series B preferred stock authorized for issuance at a par value of $0.001 per share. No preferred shares are currently issued or outstanding.
Common Shares Reserved for Future Issuance
The Company had reserved shares of common stock for possible future issuance as of December 31, 2015 and 2014 as follows (in thousands):
 
December 31,
  
2015
 
2014
Common stock warrants outstanding
1,887

 
4,118

Stock options outstanding under the 2015 Incentive Compensation Plan and previous plans
6,085

 
3,065

Restricted stock units outstanding
960

 
1,629

Shares available for issuance pursuant to Convertible Notes
30,000

 
—

Shares available for future grants of awards under the 2015 Incentive Compensation Plan
1,075

 
—

Shares available for future grants of awards under the 2009 Omnibus Incentive Compensation Plan
3,956

 
4,463

Shares available under the 2000 Employee Stock Purchase Plan
879

 
1,385

Total shares of common stock reserved for issuance
44,842

 
14,660