Stock-Based Compensation Schedule of Stock Options Activity - USD ($)	3 Months Ended	6 Months Ended
Mar. 31, 2016	Jun. 30, 2017
Compensation Related Costs [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term		5 years 4 months 3 days
Aggregate intrinsic value of options exercisable		$ 6,471,607
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value		$ 6,829,866
Weighted Average Remaining Contractual Life, Outstanding (in years)	6 years 8 months 27 days	5 years 8 months 20 days
Schedule of stock option activity
Number of Share options Outstanding, Beginning Balance		2,569,550
Number of Share options, Granted		0
Number of Share options, Exercised		(23,555)
Number of Share options, Cancelled		(5,291)
Number of Share options Outstanding, Ending Balance		2,540,704
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number		2,499,263
Number of Share options, Exercisable		2,092,512
Weighted average exercise price Outstanding, Beginning Balance		$ 9.53
Weighted average exercise price, Granted		0.00
Weighted average exercise price, Exercised		7.21
Weighted average exercise price, Cancelled		11.67
Weighted average exercise price Outstanding, Ending Balance		9.55
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price		9.51
Weighted average exercise price, Exercisable		$ 9.06

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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The number of exercisable share options (fully vested and expected to vest) that may be converted as of the balance sheet date.

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As of the balance sheet date, the weighted-average exercise price (at which grantees can acquire the shares reserved for issuance) for exercisable stock options that are fully vested or expected to vest.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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