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Net loss per share attributable to common stockholders (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Numerator:
Net loss attributable to common stockholders, basic and diluted	$ (7,882)	$ (5,448)
Denominator:
Weighted average common stock, basic and diluted (in shares)	36,390	35,350
Net loss per share attributable to common stockholders:
Basic (in dollars per share)	$ (0.22)us-gaap_EarningsPerShareBasic	$ (0.15)us-gaap_EarningsPerShareBasic
Diluted (in dollars per share)	$ (0.22)us-gaap_EarningsPerShareDiluted	$ (0.15)us-gaap_EarningsPerShareDiluted

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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