Fair Value Measurments (Tables)
 9 Months Ended
Sep. 30, 2016
Fair Value Measurements.  
Assumptions used to calculate common stock warrants

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

September 30, 2016

 

 

September 30, 2015

 

Risk-free interest rate

 

0.68

%

-

0.77

%

 

0.37

%

-

1.010

%

 

Volatility

 

59.60

%

-

60.60

%

 

55.93

%

-

123.53

%

 

Expected average term

 

1.39

 

-

2.29

 

 

0.67

 

-

3.30

 

 

 

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation

The following table shows reconciliations of the beginning and ending balances for the common stock warrant liability (in thousands):

 

 

 

 

 

 

 

 

 

 

Nine months ended

 

Common stock warrant liability

 

September 30, 2016

    

September 30, 2015

 

Beginning of period

 

$
5,735

 

$
9,418

 

Change in fair value of common stock warrants

 

 
(4,709)

 

 
(4,603)

 

Exercise of common stock warrants

 

 
(141)

 

 
(22)

 

End of period

 

$
885

 

$
4,793