Note 8 — Net Loss Per Share

The following table (in thousands, except for loss per share) reconciles basic and diluted weighted average common shares outstanding for each of the three months ended March 31, 2019 and 2018:


	Three months ended
	March 31,
	2019		2018
Weighted average common shares outstanding:
Basic		106,940		106,388
Dilutive unvested stock, convertible preferred stock, Common Stock Warrants and IPO Warrants		—		—
Diluted		106,940		106,388

Basic and diluted net loss per share attributable to common stockholders	$	(0.16)	$	(0.15)

Potentially dilutive securities not included in the diluted net loss per share computations because their effect would have been anti-dilutive were as follows (in thousands):


	Three months ended
	March 31,
	2019		2018
Unvested stock (1)		490		464
Convertible preferred stock		11,127		—
Common Stock Warrants		1,376		—
IPO Warrants(2)		12,082		12,082
Total potentially dilutive common shares		25,075		12,546

⁽¹⁾

Does not include 10.8 million shares and 26.4 million shares for the three months ended March 31, 2019 and 2018, respectively, of unvested stock because the performance conditions had not yet been satisfied.

⁽²⁾

The IPO Warrants were issued in connection with our initial public offering in 2015. The IPO Warrants are exercisable at a price of $11.50 per share and expire on July 24, 2022. The Company may redeem the IPO 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.