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Stockholders' Equity (Deficit) - Stock Option and Restricted Stock Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Balances, beginning (shares)	2,506,926
Forfeited (shares)	(6,772)
Exercised (shares)	(254,186)
Granted (shares)	804,099
Balances, ending (shares)	3,050,067	2,506,926
Outstanding, exercise price per share (in USD per share)	$ 5.31	$ 3.50
Forfeited, exercise price per share (in USD per share)	7.01
Exercised, exercise price per share (in USD per share)	1.94
Granted, exercise price per share (in USD per share)	$ 9.87
Options outstanding, weighted average remaining contractual term	8 years 6 months 10 days	8 years 9 months 14 days
Options outstanding, aggregate intrinsic value	$ 24,033
Exercised, aggregate intrinsic value	1,786
Options outstanding, aggregate intrinsic value	$ 14,880	$ 24,033

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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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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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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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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