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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2012
Stockholders' Equity Note [Abstract]  
Summary of preferred stock authorized, issued and outstanding
 
 
 
 
 
Outstanding
as of
December 31,
 
 
Authorized
 
Issued
 
2012
 
2011
Series A Preferred Stock, par $0.001
1,000

 
817

 
—

 
—

Series B Preferred Stock, par $0.001
1,000

 
750

 
—

 
—

Series C Preferred Stock, par $0.001
1,091

 
1,091

 
26

 
26

Series D Preferred Stock, par $0.001
1,966,292

 
1,966,292

 
—

 
—
Summary of warrants outstanding
The following table summarizes the warrants outstanding as of December 31, 2012 and 2011:
 
 
 
 
 
 
 
As of December 31, 2012
 
As of December 31, 2011
Issued in Connection With:
 
Exercise
Price
 
Expiration
Date
 
Number of
Warrants
 
Common Stock
Warrant Liability
 
Number of
Warrants
 
Common Stock
Warrant Liability
December 2011 financing
 
$
0.65

 
December 6, 2016
 
5,774,784

 
$
2,078,921

 
5,774,784

 
$
1,963,427

January 2011 financing
 
$
1.40

 
January 27, 2016
 
10,565,200

 
779,711

 
10,565,200

 
3,169,560

July 2009 financing
 
$
3.38

 
July 1, 2014
 
333,333

 
1,267

 
333,333

 
43,332

Warrants assumed in June 2009 Merger
 
$0.05-$1.28

 
March 24, 2013-
April 28, 2016
 
4,920,527

 
—

 
4,920,527

 
—

August 2007 consulting services
 
$
3.00

 
August 3, 2012
 
—

 
—

 
150,000

 
—

Total
 
 
 
 
 
21,593,844

 
$
2,859,899

 
21,743,844

 
$
5,176,319
Schedule of shares authorized under stock option plans, by exercise price range
The following table summarizes total stock options outstanding at December 31, 2012:
 
 
 
Options Outstanding
 
Options Exercisable
Exercise Price
 
Options
Outstanding
 
Weighted-Average
Remaining
Contractual Life
(in Years)
 
Weighted
Average
Exercise Price
 
Options
Exercisable
 
Weighted-Average
Exercise Price
$0.00 – $1.00
 
4,318,101

 
7.1
 
$
0.51

 
2,264,657

 
$
0.43

$1.01 – $2.00
 
10,542,570

 
5.1
 
$
1.30

 
9,576,401

 
$
1.32

$2.01 – $4.00
 
1,108,024

 
3.2
 
$
3.01

 
1,108,024

 
$
3.01

$4.01 – $6.00
 
238,749

 
1.2
 
$
4.87

 
238,749

 
$
4.87

$6.01 – $6.12
 
50,000

 
1.2
 
$
6.12

 
50,000

 
$
6.12

 
 
16,257,444

 
5.4
 
$
1.28

 
13,237,831

 
$
1.39
Schedule of stock options, activity
Stock option activity under our stock option plans was as follows:
 
 
Number of
Shares
 
Weighted-Average
Exercise Price
Balance, December 31, 2009
13,142,039

 
$
1.54

Granted
442,500

 
1.12

Exercised
(297,462
)
 
0.57

Cancelled
(637,109
)
 
2.75

Balance, December 31, 2010
12,649,968

 
1.49

Granted
2,068,750

 
1.10

Exercised
(68,309
)
 
0.23

Cancelled
(347,606
)
 
2.25

Balance, December 31, 2011
14,302,803

 
1.42

Granted
2,733,750

 
0.58

Exercised
—

 
—

Cancelled
(779,109
)
 
1.55

Balance, December 31, 2012
16,257,444

 
$
1.28