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Summary of Stock Option Activity (Details)	6 Months Ended
	Jun. 30, 2018 $ / shares shares
Stock Options Outstanding
Stock Options Outstanding, Beginning of year | shares	4,375,929
Stock Options Outstanding, Exercised | shares	(42,429)
Stock Options Outstanding, Cancelled | shares	(173,409)
Stock Options Outstanding, End of year | shares	4,160,091
Stock Options Outstanding, Vested | shares	2,456,208
Stock Options Outstanding, Exercisable | shares	305,004
Weighted-Average Exercise Price
Weighted-Average Exercise Price, beginning of year | $ / shares	$ 10.73
Weighted Average Exercise Price, Exercised | $ / shares	5.04
Weighted Average Exercise Price, Cancelled | $ / shares	10.33
Weighted-Average Exercise Price, end of year | $ / shares	10.80
Weighted Average Exercise Price, Vested | $ / shares	9.49
Weighted Average Exercise Price, Exercisable | $ / shares	$ 4.14

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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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For presentations that combine terminations, 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 or that expired.

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

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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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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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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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