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Fair Value Measurements
3 Months Ended
Mar. 31, 2018
Fair Value Disclosures [Abstract]  
Fair Value Measurements
Fair Value Measurements
ASC Topic 820, Fair Value Measurement, establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value, as follows: Level 1 Inputs - unadjusted quoted prices in active markets for identical assets or liabilities accessible to the reporting entity at the measurement date; Level 2 Inputs - other than quoted prices included in Level 1 inputs that are observable for the asset or liability, either directly or indirectly, for substantially the full term of the asset or liability; and Level 3 Inputs - unobservable inputs for the asset or liability used to measure fair value to the extent that observable inputs are not available, thereby allowing for situations in which there is little, if any, market activity for the asset or liability at measurement date.
The Company uses the market approach and Level 1 inputs to value its cash equivalents.
The Company’s long-term debt bore interest at the prevailing market rates for instruments with similar characteristics and, accordingly, the carrying value for this instrument also approximates its fair value and the financial measurement is also classified within Level 2 of the fair value hierarchy.
The Company’s common stock warrant liability is classified within Level 3 of the fair value hierarchy. The fair value of the common stock warrant liability was determined using the Black-Scholes option-pricing model.
The following assumptions were used to estimate the fair value of the common stock warrant liability at March 31, 2018:
 
March 31, 2018
Expected term
3.0 years

Risk-free interest rate
2.38
%
Expected volatility
78.1
%
Expected dividend yield
%

A 10% change in the estimate of expected volatility at March 31, 2018 would increase or decrease the fair value of the common stock warrant liability in the amount of $50. A 10% change in the estimate of fair value of the common stock at March 31, 2018 would increase or decrease the fair value of the common stock warrant liability in the amount of $94.
The following is a reconciliation of the Company’s liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3) for the three months ended March 31, 2018:
 
Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
 
Common Stock Warrant Liability
Balance at January 1, 2018
$
523

Loss included in other income (expense), net
128

Balance at March 31, 2018
$
651