Stockholders' Equity

12 Months Ended

Dec. 31, 2018

Stockholders’ Equity

Capital Structure

In conjunction with the completion of the Company’s initial public offering in September 2016, the Company further amended its amended and restated certificate of incorporation and amended and restated its bylaws. The amendment provides for 210,000,000 authorized shares of capital stock, of which 200,000,000 shares have been designated as $0.0001 par value common stock, and 10,000,000 shares have been designated as $0.0001 par value preferred stock.

Common Stock

The Company’s common stock has a par value of $0.0001 per share and consists of 200,000,000 authorized shares as of December 31, 2018 and 2017. There were 26,056,735 and 16,005,408 shares of common stock outstanding as of December 31, 2018 and 2017, respectively.

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



	December 31,
	2018	2017
Outstanding stock options	1,671,666	1,399,484
Warrants to purchase common stock issued in January 2018 Offering	10,000,000	—
For possible future issuance under 2016 Stock Plan (Note 10)	699,376	1,023,378
	12,371,042	2,422,862

Related Party Stock Repurchase

In April 2016, the Company repurchased 9,500 shares of common stock for an aggregate price of $155 from an executive of the Company who was also a member of the Company’s board of directors at that time. The repurchase of these shares is recorded as treasury stock on the Company’s consolidated balance sheet as of December 31, 2018 and 2017.

Preferred Stock

The Company’s amended and restated certificate of incorporation provides the Company’s board of directors with the authority to issue $0.0001 par value preferred stock from time to time in one or more series by adopting a resolution and filing a certificate of designations. Voting powers, designations, preferences, dividend rights, conversion rights and liquidation preferences shall be stated and expressed in such resolutions. There were 10,000,000 shares designated as preferred stock and no shares outstanding as of December 31, 2018 and 2017.