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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2013
Stockholders' Equity Note [Abstract]  
Summary of preferred stock authorized, issued and outstanding
 
 
 
 
 
Outstanding
as of
December 31,
 
Authorized
 
Issued
 
2013
 
2012
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, 2013 and 2012:
 
 
 
 
 
 
 
As of December 31, 2013
 
As of December 31, 2012
Issued in Connection With:
 
Exercise
Price
 
Expiration
Date
 
Number of
Warrants
 
Common Stock
Warrant Liability
 
Number of
Warrants
 
Common Stock
Warrant Liability
March 2013 financing
 
$
0.79

 
September 12, 2018
 
3,022,725

 
$
7,859,085

 
—

 
$
—

December 2011 financing
 
$
0.65

 
December 6, 2016
 
—

 
—

 
5,774,784

 
2,078,921

January 2011 financing
 
$
1.40

 
January 27, 2016
 
6,695,000

 
11,381,498

 
10,565,200

 
779,711

July 2009 financing
 
$
3.38

 
July 1, 2014
 
333,333

 
300,000

 
333,333

 
1,267

Warrants assumed in June 2009 Merger
 
$1.02-$1.28

 
August 1, 2015-
April 28, 2016
 
4,008,202

 
—

 
4,920,527

 
—

Total
 
 
 
 
 
14,059,260

 
$
19,540,583

 
21,593,844

 
$
2,859,899
Schedule of shares authorized under stock option plans, by exercise price range
The following table summarizes total stock options outstanding at December 31, 2013:
 
 
 
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
 
5,888,591

 
8.2
 
$
0.56

 
2,561,431

 
$
0.57

$1.01 – $2.00
 
9,363,064

 
4.1
 
$
1.32

 
8,903,626

 
$
1.32

$2.01 – $4.00
 
1,047,713

 
3.1
 
$
3.02

 
986,307

 
$
3.06

$4.01 – $6.00
 
188,750

 
0.3
 
$
4.86

 
188,750

 
$
4.86

$6.01 – $6.12
 
50,000

 
0.2
 
$
6.12

 
50,000

 
$
6.12

 
 
16,538,118

 
5.5
 
$
1.21

 
12,690,114

 
$
1.38
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, 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

Granted
2,913,625

 
0.61

Exercised
(1,925,214
)
 
0.81

Cancelled
(707,737
)
 
1.30

Balance, December 31, 2013
16,538,118

 
$
1.21