Note 10 - Net Loss Per Share Attributable to Common Stockholders

12 Months Ended

Dec. 31, 2019

Notes to Financial Statements

Earnings Per Share [Text Block]

Note 

10

— Net Loss Per Share Attributable to Common Stockholders

The following table (in thousands, except for loss per share) reconciles basic and diluted weighted average common shares outstanding for the years ended

December 31, 2019

 and

2018

:

	Year Ended
	December 31,
	2019			2018
Weighted average common shares outstanding:
Basic		109,057			106,564
Dilutive unvested stock, convertible preferred stock, Common Stock Warrants and IPO Warrants		—			—
Diluted		109,057			106,564
Basic and diluted net loss per share attributable to common stockholders	$	(0.45	)	$	(0.41	)

Potentially dilutive securities that were

not

included in the diluted net loss per share computations because their effect would have been anti-dilutive were as follows (in thousands):

	Year Ended
	December 31,
	2019		2018
Unvested stock (1)		861		498
Convertible preferred stock		13,697		3,552
Common Stock Warrants		1,662		454
IPO Warrants (2)		12,082		12,082
Total potentially dilutive common shares		28,302		16,586

( 1 ) Does not include 3.6 million shares and 10.8 million shares of unvested stock for the year ended December 31, 2019  and 2018  because the performance conditions had not yet been satisfied as of December 31, 2019  and 2018 , respectively.

( 2 ) The IPO Warrants are exercisable at a price of $11.50 per share and expire July 24, 2022. The Company may redeem the Warrants at a price of $0.01 per IPO Warrant upon 30 days’ notice only if the last sale price of our common stock is at least $17.50 per share for any 20 trading days within a 30 -trading day period. If the Company redeems the IPO Warrants in this manner, the Company will have the option to do so on a cashless basis with the issuance of an economically equivalent number of shares of Company common stock.