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Stock-based Compensation Option Activity (Details) - Jun. 30, 2015 - $ / shares
Total
Stock-based Compensation Option Activity Details  
Balance at beginning of period 5,327,907
Granted 229,000
Exercised (88,048)
Cancelled/forfeited (8,167)
Balance at end of period 5,460,692
Options, Vested and expected to vest 5,460,692
Options, Exercisable at end of period 3,316,717
Weighted-average exercise price of options outstanding, at beginning of period $ 5.19
Weighted-average exercise price of options granted during period 8.66
Weighted-average exercise price of options exercised during the period 3.10
Weighted-average exercise price of options forfeited, cancelled or expired during the period 6.78
Weighted-average exercise price of options outstanding at end of period 5.37
Options, Vested and Expected to Vest, Weighted Average Exercise Price 5.37
Weighted-Average Exercise Prices, Exercisable at end of period $ 3.57