Common Stock Warrants and Common Stock Warrant Liability

6 Months Ended

Jun. 30, 2017

Warrants and Rights Note Disclosure [Abstract]

Common Stock Warrants and Common Stock Warrant Liability

Note 11 - Common Stock Warrants and Common Stock Warrant Liability

The table summarizes the common stock warrant activity as of June 30, 2017 as follows: 

	Number
	of		Date
Common  Stock Warrants	Warrants		Issued	Term		Exercise Price
Outstanding at December 31,		610,487
Initial Public Offering Underwriter		187,500	December 2016		5  years	$	9.60
Marketing and Development Services		100,000	February 2016		5 years(1)	$	7.50
Other Advisory Services		40,000	August 2016		3 years(1)	$	7.50
Promissory Notes		9,031	March 2016		3 years(1)	$	7.50
Warrants issued		336,531
Warrants exercised		117,733
Outstanding at December 31, 2016		829,285
Warrants issued		—
Warrants exercised		—
Outstanding at June 30, 2017		829,285

(1) The warrants also terminate, if not exercised (i) within two years of the closing of an initial public offering of common stock; or (ii) a liquidation, dissolution or winding up of the Company.

Promissory Notes; Common Stock Warrants 

In conjunction with the issuance by the Company of certain promissory notes, the Company issued detachable common stock warrants (“Warrants”) to purchase an aggregate 270,400 shares of common stock, with an exercise price of $7.50 per share. The Warrants were exercisable until the earlier of (i) 5 years from the date of grant; (ii) within two years of the closing of an initial public offering of common stock by the Company; and (iii) the closing of liquidation, dissolution or winding up of the Company. 

The Warrants have a net share settlement (cashless exercise) provision. With this provision the holder may, in lieu of payment of the exercise price in cash, surrender the warrant and receive a net amount of shares based on the fair market value of the common stock at the time of exercise of the warrant after deduction of the aggregate exercise price. However, the Warrants would be exercised automatically in full pursuant to the net exercise provision, without any further action on behalf of the holder, immediately prior to the time the Warrants would otherwise terminate.

The Warrants are considered freestanding instruments as (i) they were transferred together with the notes issued but exist independently as a separate security; (ii) they may be exercised separately from the notes; and (iii) they are exercisable for a specific period (term) and do not impact the notes if and when exercised. 

The Company estimated the fair value of the Warrants at issuance using a Monte Carlo option pricing model based on the following significant inputs: common stock price of $7.50 to $7.575; comparable company volatility of 58.0% to 76.7%; risk- free rates of 1.31% to 1.76%; and the probability of an equity event occurring. The Company reflected the amounts recorded for the Warrants issued within stockholders’ deficit, as additional paid-in-capital. Although the Warrants are a derivative that can be net share settled, the Warrants are considered indexed to the Company’s common stock and the Company has the ability to settle the warrant contract in common shares and met the conditions within the contract to classify the Warrants as an equity instrument.

Common Stock Warrant Issued for Marketing and Development Services

In February 2016, the Company issued to a stockholder a warrant to purchase 100,000 shares of common stock at an exercise price of $7.50 per share as consideration for providing marketing and development services in Southeast Asia. The warrant was fully vested and exercisable on the date of grant. The common stock warrant has the similar features as the Warrants discussed above, except it is exercisable until the earlier of (i) five years from the date of grant; (ii) two years after the closing of an initial public offering of common stock by the Company; and (iii) the closing of a liquidation, dissolution or winding up of the Company. The Company estimated the fair value of the common stock warrant to be $431 on the date of grant using a Black- Scholes option pricing model based on the following significant inputs: common stock price of $7.57; comparable company volatility of 77.8%; remaining term 3.75 years; dividend yield of 0% and risk-free rate of 2.09%. The Company recorded the fair value of the warrant as stock-based compensation expense within general and administrative expense on the date of grant.

March 2016 Promissory Notes Common Stock Warrants

In March 2016, the Company issued certain unsecured notes with common stock warrants to purchase an aggregate of 9,032 shares of common stock at an exercise price of $7.50 per share. The common stock warrants are exercisable until the earlier of (i) three years from the date of grant; (ii) two years after the closing of an initial public offering of common stock; and (iii) the closing of a liquidation, dissolution or winding up of the Company. The Company estimated the fair value of the common stock warrants on the date of grant using a Monte Carlo pricing model based on the following significant inputs: common stock price of $7.575; comparable company volatility 79.6%; and risk-free rate of 1.49%.

August 2016 Other Advisory Services

On August 16, 2016, the Company issued to each of two advisors warrants to purchase 20,000 shares of common stock at an exercise price of $7.50 per share as consideration for providing advisory services to the Company. The warrants were fully vested and exercisable on the date of grant until the earlier of (i) three years from the date of grant; (ii) two years after the closing of an initial public offering of common stock; and (iii) the closing of a liquidation, dissolution or winding up of the Company. The Company recorded the fair value of the warrants as stock-based compensation expense within general and administrative expense on the date of grant.

Common Stock Warrant Issued To Initial Public Offering Underwriter

In December 2016, the Company issued to the underwriter of its IPO a warrant to purchase 100,000 shares of common stock at an exercise price of $9.60 per share as consideration for providing services in connection with the Company’s initial public offering. The warrant was fully vested and exercisable on the date of grant. The common stock warrant is exercisable until five years from the date of grant. The Company estimated the fair value of the common stock warrant to be $939 on the date of grant using a Black- Scholes option pricing model based on the following significant inputs: common stock price of $8.00; comparable company volatility of 82.1%; remaining term 5 years; dividend yield of 0% and risk-free rate of 1.92%.

University of Arizona Common Stock Warrant

In connection with the June 2015 amended and restated exclusive license agreement with the University of Arizona (“University”), the Company issued to the University a common stock warrant to purchase 15,000 shares of common stock at an exercise price of $7.50 per share. The warrant was fully vested and exercisable on the date of grant, and expires, if not exercised, five years from the date of grant. In the event of a “terminating change” of the Company, as defined in the warrant agreement, the warrant holder would be paid in cash the aggregate fair market value of the underlying shares immediately prior to the consummation of the terminating change event. Due to the cash settlement provision, the derivative warrant liability was recorded at fair value and is revalued at the end of each reporting period. The changes in fair value are reported in other income (expense) in the statements of operations and comprehensive loss. The estimated fair value of the derivative warrant liability was $53 at the date of grant.

The estimated fair value of the derivative warrant liability was $33 at June 30, 2017. As this derivative warrant liability is revalued at the end of each reporting period, the fair values as determined at the date of grant and subsequent periods was based on the following significant inputs using a Monte Carlo option pricing model: common stock price of $7.91; comparable company volatility of 77.7% of the underlying common stock; risk-free rates of 1.93%; and dividend yield of 0%; including the probability assessment of a terminating change event occurring. The change in fair value of the derivative warrant liability was $36 for the six months ended June 30, 2017 and was recorded in other income (expense) in the accompanying statements of operations and comprehensive loss.

July 2015 Consulting Agreement Common Stock Warrant

In July 2015, the Company issued a common stock warrant to purchase 121,227 shares of common stock, with an exercise price of $7.50 per share, as consideration for services under a consulting arrangement. The warrant was fully vested and exercisable on the date of grant. This common stock warrant has the similar features as the Warrants described above, except it is exercisable until the earlier of (i) ten years from the date of grant; (ii) two years after the closing of an initial public offering of common stock by the Company; and (iii) the closing of a liquidation, dissolution or winding up of the Company. The estimated the fair value of the common stock warrant on the date of grant was $537 as determined by using a Black-Scholes option pricing model based on the following significant inputs: common stock price of $7.575; comparable company volatility of 60.9%; expected term of 6.25 years; risk-free rate of 2.09%; and dividend yield of 0%. The Company recorded the fair value of the warrant as stock-based compensation expense within general and administrative expense in the accompanying statements of operations and comprehensive loss in 2015.

Northern Arizona University Common Stock Warrant 

In November 2015, the Company issued a common stock warrant to purchase 210,526 shares of common stock at an exercise price of $15.00 per share to Northern Arizona University (“NAU”) as part of the consideration given with the Series A convertible preferred stock in exchange for the full cancellation of a promissory note that had been previously issued to NAU.