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Stock-based Compensation - Summary of Stock Options Activity under 2018 Plan and 2015 Equity Incentive Plan (Details) - 2018 Plan and 2015 Equity Incentive Plan - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		12 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Number of Shares Available for Grant
Beginning balance	4,497,598	3,024,404
Shares authorized		1,473,194
Options granted	(449,988)
Options forfeited or canceled	15,804
Ending balance	4,063,414	4,497,598	3,024,404
Number of Shares Underlying Outstanding Options
Beginning balance	5,055,267	5,135,267
Options granted	449,988
Options forfeited or canceled	(15,804)
Options exercised	(21,284)	(80,000)
Ending balance	5,468,167	5,055,267	5,135,267
Weighted Average Exercise Price
Beginning balance	$ 6.14	$ 5.99
Options granted	8.40
Options forfeited or canceled	7.00
Options exercised	2.77	1.04
Ending balance	$ 6.34	$ 6.14	$ 5.99
Weighted Average Remaining Contractual Term (in years)
Weighted Average Remaining Contractual Term (in years)	8 years 8 months 8 days	8 years 8 months 8 days	9 years 25 days
Aggregate Intrinsic Value
Beginning balance	$ 8,769	$ 10,681
Options exercised	190	290
Ending balance	$ 29,716	$ 8,769	$ 10,681

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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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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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