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Stock Option Plan - Activity Under The Stock Option Plan (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018	Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock options available for grant (in shares)	10,149	10,149	29,654
Number of Shares
Balance at December 31, 2017 (in shares)		3,001,929
Options granted (in shares)		73,783
Options exercised (in shares)		(309,767)
Options cancelled (in shares)		(54,278)
Balance at September 30, 2018 (in shares)	2,711,667	2,711,667
Options vested and exercisable - September 30, 2018 (in shares)	1,639,606	1,639,606
Options vested and expected to vest - September 30, 2018 (in shares)	2,489,664	2,489,664
Weighted-Average Exercise Price
Balance at December 31, 2018 (in dollars per share)		$ 4.15
Options granted (in dollars per share)	$ 9.88	5.51
Options exercised (in dollars per share)		4.11
Options cancelled (in dollars per share)		4.77
Balance at September 20, 2018 (in dollars per share)	4.12	4.12
Options vested and exercisable - September 30, 2018 (in dollars per share)	3.65	3.65
Options vested and expected to vest - September 30, 2018 (in dollars per share)	$ 4.01	$ 4.01
Weighted-Average Remaining Contractual Life and Aggregate Intrinsic Value
Weighted-average remaining contractual life, options outstanding (in years)		6 years 9 months 18 days
Weighted-average remaining contractual life, options vested and exercisable (in years)		6 years
Weighted-average remaining contractual life, options vested and expected to vest (in years)		6 years 8 months 12 days
Aggregate intrinsic value at December 31, 2017		$ 3,585
Aggregate intrinsic value, options exercised		960
Aggregate intrinsic value at September 30, 2018	$ 23,957	23,957
Aggregate intrinsic value, options vested and exercisable at September 30, 2018	15,271	15,271
Aggregate intrinsic value, options vested and expected to vest at September 30, 2018	$ 22,285	$ 22,285

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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