6. Stockholders’ Equity

Common Stock

Common stockholders are entitled to dividends if and when declared by the board of directors. As of December 31, 2017, no dividends on common stock had been declared by the board of directors.

The Company had reserved shares of common stock for future issuance as follows:


	December 31,
	2017	2016
Options issued and outstanding	1,593,195	1,414,730
Shares available for future option grants	83,929	342,500
Common stock warrants	27,690	27,690
Total	1,704,814	1,784,920

Warrants

In connection with a credit facility, the Company issued to Silicon Valley Bank a warrant to purchase 3,076 shares of the Company’s Series A redeemable convertible preferred stock at an exercise price of $26.00 per share. The warrant could be exercised at any time and would expire, if not exercised, on December 14, 2019. At the date of issuance, the Company recorded the warrant as a debt discount of $63,000 and as a liability on the balance sheet at its fair value. At the date of the IPO of the Company’s common stock, the warrant was converted into a warrant to purchase 3,076 shares of the Company’s common stock. The warrant was remeasured to its fair value of $1,600 and the carrying value of the warrant of $1,600 was reclassified to additional paid in capital during the year ended December 31, 2016.

In connection with a credit facility, the Company issued to Silicon Valley Bank a warrant to purchase 6,153 shares of the Company’s Series B redeemable convertible preferred stock at an exercise price of $26.00 per share. The warrant can be exercised at any time and expires 10 years after the date of issuance. The Company recorded the warrant as a debt discount and as a liability on the balance sheet at its fair value of $106,000 on the date of issuance using the Black-Scholes option-pricing model. At the date of the IPO of the Company’s common stock, the warrant was converted into a warrant to purchase 6,153 shares of the Company’s common stock. The warrant was remeasured to its fair value of $14,900 and carrying value of the warrant of $14,900 was reclassified to additional paid in capital during the year ended December 31, 2016.

In connection with the 2015 Credit Facility, the Company issued to Ares Venture Finance a warrant to purchase 18,461 shares of the Company’s Series B redeemable convertible preferred stock at an exercise price of $26.00 per share. The warrant can be exercised at any time and expires 10 years after the date of issuance. The Company recorded the warrant as a debt discount and as a liability on the balance sheet at its fair value of $307,000 on the date of issuance using the Black-Scholes option-pricing model. At the date of the IPO of the Company’s common stock, the warrant was converted into a warrant to purchase 18,461 shares of the Company’s common stock. The warrant was remeasured to its fair value of $48,900 and the carrying value of the warrant of $48,900 was reclassified to additional paid-in capital during the year ended December 31, 2016.