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Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2018
Fair Value Disclosures [Abstract]  
Schedule of Assumptions used to Estimate Fair Value of Warrant Liability
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
%
Reconciliation of Liabilities Measured at Fair Value on a Recurring Basis
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