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Fair Value of Financial Instruments
6 Months Ended
Jun. 30, 2016
Fair Value Disclosures [Abstract]  
Fair Value of Financial Instruments

4.

Fair Value of Financial Instruments

The Company’s financial instruments that are carried at fair value mainly consist of Level 1 assets and Level 3 liabilities. Level 1 assets include highly liquid bank deposits and money market funds, which were not material at June 30, 2016 and December 31, 2015. Level 3 liabilities that are measured on a recurring basis consist of the convertible preferred stock warrant liability. The convertible preferred stock warrant liability was valued using the Black-Scholes option-pricing model. Generally, increases (decreases) in the fair value of the underlying stock and estimated term would result in a directionally similar impact to the fair value of the warrant (see Note 8).

The gains and losses from re-measurement of Level 3 financial liabilities are recorded as part of other income (expense), net in the condensed consolidated statements of operations.  The Company recorded a loss of $15 thousand and a gain of $51 thousand related to the change in fair value of financial liabilities during the three and six months ended June 30, 2015. The Company had no change in fair value of financial liabilities for the three and six months ended June 30, 2016 as the related convertible preferred stock warrants were converted into warrants to purchase the Company’s common stock upon closing of the Merger in July 2015 and no re-measurement is required thereafter.