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Net income per share - Reconciliation of Numerator and Denominator in Basic and Diluted Net Income (Loss) Per Common Share Computations (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
Numerator:
Net income	$ 1,248	$ 3,970	$ 1,938	$ 6,130
Denominator:
Weighted average common shares outstanding - basic (in shares)	46,625,915	45,465,723	46,531,264	44,786,305
Weighted average common shares outstanding - diluted (in shares)	49,425,927	49,509,940	49,364,875	49,524,447
Net income per share:
Basic (in USD per share)	$ 0.03	$ 0.09	$ 0.04	$ 0.14
Diluted (in USD per share)	$ 0.03	$ 0.08	$ 0.04	$ 0.12
Anti-dilutive securities excluded from diluted EPS:
Anti-dilutive securities excluded from diluted EPS (in shares)	2,841,357	585,103	2,710,733	864,340
Stock Options
Anti-dilutive securities excluded from diluted EPS:
Anti-dilutive securities excluded from diluted EPS (in shares)	2,219,821	585,103	2,040,389	849,975
Restricted Stock Units
Anti-dilutive securities excluded from diluted EPS:
Anti-dilutive securities excluded from diluted EPS (in shares)	394,886	0	425,226	14,365
Restricted Stock Awards
Anti-dilutive securities excluded from diluted EPS:
Anti-dilutive securities excluded from diluted EPS (in shares)	226,650	0	245,118	0
Stock Options
Denominator:
Diluted common equivalents (in shares)	2,595,745	3,751,824	2,658,405	4,461,187
Restricted Stock Units
Denominator:
Diluted common equivalents (in shares)	153,050	275,147	140,280	266,137
Restricted Stock Awards
Denominator:
Diluted common equivalents (in shares)	51,217	17,246	34,926	10,818

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