Note 14. Convertible Preferred Stock Warrants and Common Stock Warrants

Immediately prior to the Company’s IPO, all outstanding Series B-1 convertible preferred stock warrants were remeasured to their fair value, using the Black-Scholes model. Refer to Note 3, Basis of Presentation and Summary of Significant Accounting Policies, for a description of the valuation method. The final remeasurement of the convertible preferred stock warrant liability resulted in a $3.7 million loss which was recorded to other expense, net.

Upon the closing of the IPO, the entire balance of $5.7 million in convertible preferred stock warrant liability was reclassified to additional paid-in capital. All convertible preferred stock warrants were converted into common stock warrants. In addition, the Company issued to the lead underwriter in the IPO a warrant to purchase up to 84,000 shares of its common stock.

During the year ended December 31, 2018, certain warrants were exercised on a cashless basis and converted into 25,145 shares of common stock.

At December 31, 2016, the Company had the following Series B-1 convertible preferred stock warrants issued and outstanding (in thousands, except share and per share data):

In March 28, 2017, in connection with the amendment of the 2015 Term Note (see Note 9, Financing Arrangements for details regarding the amendment of the 2015 Term Note), the Company issued a warrant to purchase 76,704 shares of Series B-1 preferred stock at an exercise price of $5.8667 per share which was reduced to 61,363 shares upon the completion of the Company’s IPO because greater than $25 million in proceeds were raised. The Company determined the fair value of the warrants on the date of issuance to be $111,000. The warrants were immediately exercisable.

In June 2017, in connection with its public offering, the Company issued a warrant to purchase 84,000 shares of common stock to its lead underwriter (the “June 2017 Warrant”). The Company determined the fair value of the June 2017 Warrant on the date of issuance to be $0.3 million. The June 2017 Warrant was immediately exercisable.