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FAIR VALUE MEASUREMENTS (Tables)
 6 Months Ended
Jun. 30, 2017
Fair Value Disclosures [Abstract]  
Quantitative inputs
If we added or subtracted five percentage points with regard to our estimate of expected volatility, or if our stock price increased or decreased by five percent, our estimates of fair value would change approximately as follows (in thousands):
Change in volatility
Increase
 
Decrease
CBG Financing Warrants
$
245

 
$
245

VDC Financing Warrants
225

 
195

CBG Acquisition Warrants
575

 
630

VDC Acquisition Warrants
430

 
345

 
 
 
 
Change in stock price
 
 
 
CBG Financing Warrants
$
135

 
$
165

VDC Financing Warrants
85

 
85

CBG Acquisition Warrants
345

 
170

VDC Acquisition Warrants
170

 
85

The following table presents the quantitative inputs, which we classify in Level 3 of the fair value hierarchy, used in estimating the fair value of the warrants:
 
June 30, 2017
 
December 31, 2016
Warrants issued in February 2012
 
 
 
 
 
 
 
Expected volatility
45.00
%
 
 
 
45.00
%
 
 
Risk-free interest rate
0.93
%
 
 
 
0.69
%
 
 
Expected remaining term (years)
0.16

 
 
 
0.66

 
 
 
 
 
 
 
 
 
 
 
June 30, 2017
 
December 31, 2016
 
VDC
 
CBG
 
VDC
 
CBG
Financing Warrants
 
 
 
 
 
 
 
Expected volatility
50.00
%
 
50.00
%
 
50.00
%
 
50.00
%
Risk-free interest rate
1.59
%
 
1.59
%
 
1.64
%
 
1.64
%
Expected remaining term (years)
3.23

 
3.23

 
3.73

 
3.73

Acquisition Warrants
 
 
 
 
 
 
 
Expected volatility
50.00
%
 
50.00
%
 
50.00
%
 
50.00
%
Risk-free interest rate
1.59
%
 
2.04
%
 
1.64
%
 
2.21
%
Expected remaining term (years)
3.23

 
6.22

 
3.73

 
6.72
Reconciliation of liabilities of warrants
The following table presents the reconciliation of the beginning and ending balances of the liabilities associated with the VDC and CBG Acquisition Warrants, the VDC and CBG Financing Warrants and the warrants issued in February 2012 that remain outstanding (in thousands):
 
Six Months Ended June 30,
 
Year Ended December 31,
 
2017
 
2016
Balance at beginning of period
$
25,030

 
$
19,195

New warrant issuances
—

 
11,625

Increase (decrease) in fair value
(8,329
)
 
(5,790
)
Balance at end of period
$
16,701

 
$
25,030

 
 
 
 
Reconciliation of earnout payments
The following table presents the change during the six months ended June 30, 2017 in the balance of the liability associated with the Earnout Payments (in thousands):
Balance at beginning of period
$
2,860

Change in fair value of contingent consideration
20

Balance at end of period
$
2,880