STOCKHOLDERS' EQUITY, STOCK-BASED COMPENSATION AND NET LOSS PER SHARE (Tables)
 12 Months Ended
Dec. 31, 2019
Stockholders' Equity Note [Abstract]  
Summary of Fair Value of Stock Option Awards
We estimate the fair value of stock option awards using the BSM Model. During the periods noted, we applied the following weighted-average assumptions:
 
Year Ended December 31,
 
2019
 
2018
Expected term in years
6.0

 
6.0

Expected volatility
70
%
 
60
%
Expected dividends
—
%
 
—
%
Risk-free interest rate
1.86
%
 
2.37
%
Summary of Activity Under Equity Incentive Plans Related to Equity-Classified Stock Option Grants
The following table summarizes activity under our equity incentive plans related to equity-classified stock option grants as of December 31, 2019, and changes during the twelve months then ended:
 
Shares
 
Weighted-Average Exercise Price
 
Weighted-Average Remaining Contractual Term
(in years)
 
Aggregate Intrinsic Value (in thousands)
Outstanding at January 1, 2019
10,874,849

 
$
4.36

 
 
 
 
Granted
805,250

 
0.73

 
 
 
 
Exercised
(2,250
)
 
1.99

 
 
 
 
Forfeited, cancelled or expired
(1,318,770
)
 
3.37

 
 
 
 
Outstanding at December 31, 2019
10,359,079

 
$
4.20

 
6.8
 
$
—

Exercisable at December 31, 2019
9,748,892

 
$
4.42

 
6.6
 
$
—



The following table summarizes activity related to the liability-classified China Cash Bonuses as of December 31, 2019, and changes during the twelve months then ended:
 
Shares
 
Weighted-Average Exercise Price
 
Weighted-Average Remaining Contractual Term
(in years)
 
Aggregate Intrinsic Value (in thousands)
Outstanding at January 1, 2019
1,464,750

 
$
5.60

 
 
 
 
Granted
152,000

 
1.56

 
 
 
 
Forfeited, cancelled or expired
(518,000
)
 
5.11

 
 
 
 
Outstanding at December 31, 2019
1,098,750

 
$
5.21

 
6.4
 
$
—

Exercisable at December 31, 2019
911,500

 
$
5.20

 
6.0
 
$
—
Summary of Non-vested Stock Options

The following table summarizes the status of non-vested stock options as of December 31, 2019, and changes during the year then ended:
 
Shares
 
Weighted-Average
Grant-Date Fair Value
Non-vested at January 1, 2019
244,625

 
$
439

Granted
805,250

 
335

Vested
(408,313
)
 
464

Forfeited
(31,375
)
 
68

Non-vested at December 31, 2019
610,187

 
$
241
Summary of Share-based Compensation Cost
The following table presents a breakdown of share-based compensation cost included in operating expense for continuing operations and for discontinued operations (in thousands):
 
Year Ended December 31,
 
2019
 
2018
Stock options
$
425

 
$
13,494

China Cash Bonuses
(106
)
 
(546
)
Restricted stock
—

 
—

Total
$
319

 
$
12,948



We record share-based compensation expense in the books of the subsidiary that incurs the expense, while for equity-classified stock options we record the change in additional paid-in capital on the corporate entity because the corporate entity’s equity underlies such stock options.

The following table presents information regarding unrecognized share-based compensation cost associated with stock options and China Cash Bonuses:
 
December 31, 2019
Unrecognized share-based compensation cost for non-vested awards (in thousands):
 
Stock options
191

China Cash Bonuses
5

Weighted-average years over which unrecognized share-based compensation expense will be recognized:
 
Stock options
1.1

China Cash Bonuses
0.2