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Stock-based Compensation (Tables)
 12 Months Ended
Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of stock-based compensation expense
Stock-based compensation expense is included in the consolidated statements of operations as follows (in thousands): 
 
Years Ended December 31,
 
2014
 
2013
 
2012
Research and development
$
953

 
$
1,201

 
$
2,334

Selling, general and administrative
3,667

 
3,188

 
2,742

 
$
4,620

 
$
4,389

 
$
5,076
Schedule of unrecognized compensation cost, nonvested awards
As of December 31, 2014, the unrecognized stock-based compensation cost, net of expected forfeitures, and the estimated weighted-average amortization period, using the straight-line attribution method, was as follows (in thousands, except amortization period):
 
 
Unrecognized Compensation Cost
 
Weighted-average remaining amortization period (years)
Stock options
 
$
1,306

 
2.75
RSUs
 
1,027

 
1.13
RSAs
 
1,222

 
1.24
PSUs
 
259

 
0.68
Total unrecognized stock-based compensation expense
 
$
3,814

 
 
Schedule of share-based compensation, activity
The following table summarizes equity awards activity under the 2010 Plan and related information (in thousands:
 
 
 
Number of Shares Subject to Outstanding Options
 
Weighted-average Exercise Price of Outstanding Options
 
Number of Shares Subject to Outstanding RSUs
 
Weighted Average Fair Value per Share at Grant
 
Number of Shares Outstanding RSAs Subject to Vesting
 
Weighted-average Fair Value per Share at Grant
 
Number of Shares Outstanding Subject to Performance Conditions
 
Weighted-average Fair Value per Share at Grant
December 31, 2011
 
7,904

 
$
7.35

 
546

 
$
—

 
 
 
 
 
—

 
$
—

Granted
 
1,521

 
3.42

 
1,148

 
3.54

 
 
 
 
 
—

 
—

Exercised
 
(708
)
 
1.78

 
 
 
 
 
 
 
 
 
 
 
 
Released
 
 
 
 
 
(167
)
 
 
 
 
 
 
 
—

 
 
Forfeited
 
(2,584
)
 
8.23

 
(569
)
 
 
 
 
 
 
 
—

 
—

December 31, 2012
 
6,133

 
6.65

 
958

 
 
 
800

 
3.41

 
—

 
—

Granted
 
922

 
2.28

 
2,101

 
1.80

 
216

 
2.32

 
523

 
2.32

Exercised
 
(326
)
 
0.98

 
 
 
 
 
 
 

 
 
 
 
Released
 
 
 
 
 
(325
)
 
 
 
(200
)
 
3.41

 
—

 
—

Forfeited
 
(2,603
)
 
7.35

 
(496
)
 
 
 
—

 
—

 
(165
)
 
—

December 31, 2013
 
4,126

 
5.68

 
2,238

 
—

 
816

 
3.12

 
358

 
—

Granted
 
1,075

 
2.01

 
155

 
2.14

 
599

 
1.64

 
835

 
2.00

Exercised
 
(145
)
 
1.33

 
 
 
 
 
 
 
 
 
 
 
 
Released
 
 
 
 
 
(923
)
 
 
 
(454
)
 
2.45

 
—

 
—

Forfeited
 
(1,575
)
 
6.11

 
(418
)
 
 
 
(49
)
 
2.54

 
(444
)
 
—

December 31, 2014
 
3,481

 
4.53

 
1,052

 
 
 
912

 
2.51

 
749

 
—

Options/RSUs vested and expected to vest at December 31, 2014
 
3,341

 
4.64

 
1,002

 
 
 
 
 
 
 
 
 
 
Options exercisable at December 31, 2014
 
2,072

 
$
6.04

 
 
 
 
 
 
 
 
 
 
 
 
Assumptions used to estimate the fair value of option grants
We based the range of weighted-average estimated values of employee stock option grants and rights granted under the employee stock purchase plan, as well as the weighted-average assumptions used in calculating these values, on estimates at the date of grant, as follows:
 
Years Ended December 31,
 
2014
 
2013
 
2012
Expected life (years)
6.0

 
6.0

 
6.0

Volatility
65
%
 
65
%
 
61
%
Risk-free interest rate
1.9
%
 
1.2
%
 
1.0
%
Expected dividend yield
0.0
%
 
0.0
%
 
0.0
%
Weighted-average estimated fair value of stock options granted
$
1.20

 
$
1.34

 
$
1.91
Information about stock options outstanding and exercisable by exercise price range
The following table summarizes information about stock options outstanding and exercisable at December 31, 2014 (amounts in thousands, except per share and years):
 
Options Outstanding
 
Options Exercisable
Exercise Prices
Number
of
Options
 
Weighted
Average
Remaining
Contractual
Term
(Years)
 
Weighted
Average
Exercise
Price per
Share
 
Number
of
Options
 
Weighted
Average
Exercise
Price per
Share
$0.90 - $1.97
889

 
8.16
 
$
1.83

 
113

 
$
1.05

$1.98 - $2.45
920

 
6.46
 
2.35

 
491

 
2.38

$3.41 - $7.46
916

 
6.24
 
4.67

 
719

 
4.98

$7.81 - $11.87
756

 
5.12
 
10.21

 
749

 
10.22

 
3,481

 
6.54
 
$
4.53

 
2,072

 
$
6.04