Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Tables)

v3.8.0.1
Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 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 three months ended March 31, 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

Cancelled or expired
(310
)
 
5.13

 
 
 
 
Outstanding March 31, 2018
2,534

 
$
7.23

 
5.70
 
$
—

Exercisable March 31, 2018
1,749

 
$
9.02

 
4.30
 
$
—

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 March 31,
 
2017
Volatility
77.41
%
Risk free interest rate
2.22
%
Dividend yield
0.00
%
Term (years)
7.14

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 March 31,
 
2017
Volatility
73.57
%
Risk free interest rate
2.03
%
Dividend yield
0.00
%
Term (years)
6.00

Weighted-average fair value of options granted during the period
1.63

Nonvested restricted stock shares activity
The following table summarizes the activities for our non-vested restricted stock awards for the three months ended March 31, 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
(2
)
 
6.30

Cancelled
(20
)
 
$
6.50

Non-vested at March 31, 2018
69

 
$
3.48

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 March 31,
 
2018
 
2017
Cost of revenues
$
91

 
$
59

Research and development
15

 
50

General and administrative
158

 
300

Sales and marketing
10

 
26

Total stock-based compensation
$
274

 
$
435