10. Net loss per share attributable to common stockholders

The following table sets forth the computation of basic and diluted net loss per share attributable to common stockholders:

	Three Months Ended June 30,						Six Months Ended June 30,
	2017			2016			2017			2016
	(in thousands)
Numerator:
Net loss attributable to common stockholders, basic and diluted	$	(8,017	)	$	(7,266	)	$	(14,897	)	$	(17,250	)
Denominator:
Weighted average common stock, basic and diluted	39,286			37,944			38,997			37,749
Net loss per share attributable to common stockholders:
Basic and diluted	$	(0.20	)	$	(0.19	)	$	(0.38	)	$	(0.46	)

For the three and six months ended June 30, 2017 and 2016, we excluded all assumed exercises of stock options and the assumed issuance of common stock under RSUs from the computation of diluted net loss per share as the effect would be anti-dilutive due to the net loss for the period.

On April 1, 2013, the Company approved a stock repurchase program to repurchase up to $10,000 of the Company’s common stock in the open market, exclusive of any commissions, markups or expenses. The stock repurchased will be retired and will resume the status of authorized but unissued shares of common stock. The Company did not repurchase any of our common stock during the three and six months ended June 30, 2017. As of June 30, 2017, the remaining approved amount for repurchases was approximately $5,180.