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Stock Options - Summary of Activity of Option Plans (Details)	6 Months Ended
	Jun. 30, 2019 $ / shares shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Outstanding Option Shares, Beginning Balance | shares	7,763,464
Stock options outstanding | shares	998,177
Option, Exercised | shares	(376,247)
Option, Forfeited/canceled | shares	(279,912)
Outstanding Option Shares, Ending Balance | shares	8,105,482
Weighted-Average Exercise Price Outstanding at Beginning Balance | $ / shares	$ 5.00
Weighted-Average Exercise Price, Granted | $ / shares	13.38
Weighted-Average Exercise Price, Exercised | $ / shares	1.01
Weighted-Average Exercise Price, Forfeited/canceled | $ / shares	9.80
Weighted-Average Exercise Price Outstanding at Ending Balance | $ / shares	$ 6.06

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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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-SubTopic 10
-Section 50
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Weighted average price of options that were either forfeited or expired.

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

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

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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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