Net loss per share (Tables)

6 Months Ended

Jun. 30, 2015

Earnings Per Share [Abstract]

Schedule of Computation of Basic and Diluted Earnings Per Share

The detail of the computation of basic and diluted earnings per share is as follows:

	THREE MONTHS ENDED JUNE 30,						SIX MONTHS ENDED JUNE 30,
	2015			2014			2015			2014
Numerator
Net loss	$	(4,750	)	$	(5,424	)	$	(11,162	)	$	(9,653	)
Accretion for liquidation preference on preferred stock		—			—			—			(1,133	)
Accretion for share issuance costs on preferred stock		—			—			—			(20	)
Tax expense on preferred stock		—			—			—			(100	)
Reversal of tax payable on preferred stock due to conversion of preferred stock		—			—			—			1,898
Extinguishment of remaining share issuance costs due to conversion of preferred stock		—			—			—			(439	)
Total loss attributable to common stockholders	$	(4,750	)	$	(5,424	)	$	(11,162	)	$	(9,447	)
Denominator
Weighted average shares used to compute basic and diluted net loss per common share		10,723,584			10,675,260			10,717,808			6,606,091
Net loss per share attributable to common stockholders – basic and diluted	$	(0.44	)	$	(0.51	)	$	(1.04	)	$	(1.43	)

Schedule of Antidilutive Securities Excluded from Computation of Basic and Diluted Net Loss Per Share

The following have been excluded from the computation of basic and diluted net loss per share as their effect would have been antidilutive:

	THREE MONTHS ENDED JUNE 30,				SIX MONTHS ENDED JUNE 30,
	2015		2014		2015		2014
Outstanding stock options		1,056,892		630,159		1,067,799		805,659
Common stock warrants		11,363		11,363		11,363		11,363
		1,068,255		641,522		1,079,162		817,022