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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
Mar. 31, 2018
Mar. 31, 2017
Numerator:    
Net income $ 690 $ 2,160
Denominator:    
Weighted average common shares outstanding - basic (in shares) 46,435,560 44,099,338
Weighted average common shares outstanding - diluted (in shares) 49,302,771 49,477,874
Net income per share:    
Basic (in USD per share) $ 0.01 $ 0.05
Diluted (in USD per share) $ 0.01 $ 0.04
Anti-dilutive securities excluded from diluted EPS:    
Anti-dilutive securities excluded from diluted EPS (in shares) 2,580,109 670,000
Stock Options    
Anti-dilutive securities excluded from diluted EPS:    
Anti-dilutive securities excluded from diluted EPS (in shares) 1,860,957 620,000
Restricted Stock Units    
Anti-dilutive securities excluded from diluted EPS:    
Anti-dilutive securities excluded from diluted EPS (in shares) 455,566 50,000
Restricted Stock Awards    
Anti-dilutive securities excluded from diluted EPS:    
Anti-dilutive securities excluded from diluted EPS (in shares) 263,586 0
Stock Options    
Denominator:    
Diluted common equivalents (in shares) 2,721,065 5,119,598
Restricted Stock Units    
Denominator:    
Diluted common equivalents (in shares) 127,510 255,485
Restricted Stock Awards    
Denominator:    
Diluted common equivalents (in shares) 18,636 3,453