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STOCK OPTION PLAN AND STOCK-BASED COMPENSATION - Stock Option Activity (Details)
 9 Months Ended
Sep. 30, 2017
$ / shares
shares
Shares Issuable Pursuant to Stock Options  
Outstanding at the beginning of period (in shares) 3,974,143
Granted (in shares) 435,000
Exercised (in shares) (197,874)
Forfeited (in shares) (213,619)
Outstanding at the end of the period (in shares) 3,997,650
Exercisable at the end of the period (in shares) 2,301,624
Available for future grant (in shares) 1,375,154
Weighted-Average Exercise Price  
Outstanding at the beginning of period (in dollars per share) | $ / shares $ 6.61
Granted (in dollars per share) | $ / shares 8.76
Exercised (in dollars per share) | $ / shares 5.71
Forfeited (in dollars per share) | $ / shares 8.09
Outstanding at the end of the period (in dollars per share) | $ / shares 6.80
Exercisable at the end of the period (in dollars per share) | $ / shares $ 6.00