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Net income (loss) per share attributable to common stockholders (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Apr. 01, 2013
Numerator:
Net income (loss) attributable to common stockholders, basic and diluted	$ 2,115	$ (8,017)	$ (1,114)	$ (14,897)
Denominator:
Weighted average common stock, basic (in shares)	41,961,000	39,286,000	41,645,000	38,997,000
Weighted average common stock, diluted (in shares)	45,219,000	39,286,000	41,645,000	38,997,000
Net income (loss) per share attributable to common stockholders:
Basic (in dollars per share)	$ 0.05	$ (0.20)	$ (0.03)	$ (0.38)
Diluted (in dollars per share)	$ 0.05	$ (0.20)	$ (0.03)	$ (0.38)
Stock repurchase program
Remaining approved amount for repurchases	$ 5,180		$ 5,180
RSUs
Net income (loss) per share attributable to common stockholders:
Shares of common stock excluded from the computation of diluted net income per share that were anti-dilutive	27,000
Stock options
Denominator:
Effect of dilutive (in shares)	472,000	0	0	0
RSUs
Denominator:
Effect of dilutive (in shares)	2,786,000	0	0	0
Maximum
Stock repurchase program
Amount of common stock approved by the entity for a stock repurchase program					$ 10,000