Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Tables)

v3.10.0.1
Stock-Based Compensation (Tables)
9 Months Ended
Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of employee and nonemployee stock option activity
A summary of employee and non-employee stock option activity for the nine months ended September 30, 2018 is as follows:
 
Options Outstanding
 
Weighted-
Average
Remaining
Contractual
Term (in years)
 
Aggregate
Intrinsic
Value
(in thousands)
 
Number of
Shares
(in thousands)
 
Weighted-
Average
Exercise
Price
 
Outstanding January 1, 2018
2,844

 
$
7.00

 
6.96
 
$
4

Granted
757

 
0.91

 
 
 
 
Cancelled or expired
(560
)
 
5.14

 
 
 
 
Outstanding September 30, 2018
3,041

 
$
5.83

 
5.97
 
$
92

Exercisable September 30, 2018
1,838

 
$
8.50

 
3.91
 
$

Weighted-average assumptions used to estimate fair value of options granted
The following table presents the weighted-average assumptions used to estimate the fair value of options reaching their measurement date for non-employees during the periods presented:
 
Three Months Ended September 30, 2017
 
Nine Months Ended September 30, 2017
Volatility
74.39
%
 
76.06
%
Risk free interest rate
2.17
%
 
2.19
%
Dividend yield
0.00
%
 
0.00
%
Term (years)
6.64

 
6.89

The following table presents the weighted-average assumptions used to estimate the fair value of options granted to employees during the periods presented:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2018
 
2017
 
2018
 
2017
Volatility
76.89
%
 
75.28
%
 
77.69
%
 
74.60
%
Risk free interest rate
2.76
%
 
1.92
%
 
2.88
%
 
1.97
%
Dividend yield
0.00
%
 
0.00
%
 
0.00
%
 
0.00
%
Term (years)
6.32

 
5.73

 
6.47

 
5.90

Weighted-average fair value of options granted during the period
$
0.72

 
$
1.91

 
$
0.64

 
$
1.89

Nonvested restricted stock shares activity
The following table summarizes the activities for our non-vested restricted stock awards for the nine months ended September 30, 2018:
 
Non-vested Restricted Stock Awards
 
Number of
Shares
(in thousands)
 
Weighted-Average Grant Date Fair Value
Non-vested at January 1, 2018
91

 
$
4.21

Vested
(21
)
 
4.10

Cancelled
(23
)
 
6.66

Non-vested at September 30, 2018
47

 
$
3.08

Effects of stock-based compensation related to stock option and restricted stock awards
The following table presents the effects of stock-based compensation related to stock option and restricted stock awards to employees and non-employees on our Consolidated Statements of Operations and Other Comprehensive Loss during the periods presented (in thousands):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2018
 
2017
 
2018
 
2017
Cost of revenues
$
52

 
$
122

 
$
233

 
$
250

Research and development
13

 
11

 
44

 
110

General and administrative
101

 
356

 
399

 
949

Sales and marketing
23

 
30

 
55

 
86

Total stock-based compensation
$
189

 
$
519

 
$
731

 
$
1,395