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Fair Value of Financial Instruments
6 Months Ended
Jun. 30, 2015
Fair Value Disclosures [Abstract]  
Fair Value of Financial Instruments
Fair Value of Financial Instruments
Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3)
The following table presents the changes in the Level 3 instruments measured at fair value on a recurring basis for the three and six months ended June 30, 2014 (in thousands):
 
 
 
Three Months Ended June 30, 2014
 
Six Months Ended June 30, 2014
Warrant liability balance - beginning of period
 
$
11,078

 
$
4,446

Issuance of warrants at fair value
 
4

 
4

Change in fair value
 
2,190

 
8,822

Warrant liability balance - end of period
 
$
13,272

 
$
13,272



The warrant liability is classified within Level 3 due to the liability being valued using significant unobservable inputs. Fair value of these warrants is based on a valuation of our common stock. As the valuation of our common stock was determined prior to our initial public offering, we used a combination of the inputs including option pricing models, secondary transactions with third-party investors and an initial public offering scenario to determine the valuation of our common stock.

A hypothetical increase or decrease in assumed asset volatility of 10% in the option pricing model would result in an immaterial impact to the fair value of the warrants as of June 30, 2014. In the unaudited consolidated statements of operations, changes in fair value are included in warrant liability fair value adjustment.

For the three and six months ended June 30, 2015 we did not hold any material Level 3 instruments measured at fair value on a recurring basis.
Assets and Liabilities Disclosed at Fair Value
As loans are not measured at fair value, the following discussion relates to estimating the fair value disclosure under ASC Topic 825. The fair value of loans is estimated by discounting scheduled cash flows through the estimated maturity. The estimated market discount rates used for loans are our current offering rates for comparable loans with similar terms.
The carrying amounts of certain of our financial instruments, including loans and loans held for sale, approximate fair value due to their short-term nature and are considered Level 3. The carrying amount of our financing obligations, such as fixed-rate debt, approximates fair value, considering the borrowing rates currently available to us for financing obligations with similar terms and credit risks.