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Stock Option Plan - Stock Option Activity (Details) $ / shares in Units, $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding, December 31, 2019 (in shares) | shares	1,375,542
Granted (in shares) | shares	580,731
Exercised (in shares) | shares	(47,299)
Forfeited (in shares) | shares	(222,296)
Expired (in shares) | shares	(9,678)
Outstanding, June 30, 2020 (in shares) | shares	1,677,000	1,375,542
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Outstanding, December 31, 2019, Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 8.33
Granted, Weighted Average Exercise Price (in dollars per share) | $ / shares	18.78
Exercised, Weighted Average Exercise Price (in dollars per share) | $ / shares	0.27
Forfeited, Weighted Average Exercise Price (in dollars per share) | $ / shares	9.84
Expired, Weighted Average Exercise Price (in dollars per share) | $ / shares	29.22
Outstanding, June 30, 2020, Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 11.85	$ 8.33
Stock Options, Additional Disclosures [Abstract]
Outstanding, Weighted Average Remaining Contractual Term	9 years 25 days	9 years 1 month 28 days
Vested and expected to vest, Weighted Average Remaining Contractual Term	9 years 25 days
Options exercisable, Weighted Average Remaining Contractual Term	8 years 1 month 20 days
Outstanding, Aggregate Intrinsic Value | $	$ 5,820	$ 23,654
Vested and expected to vest, Aggregate Intrinsic Value | $	5,820
Options exercisable, Aggregate Intrinsic Value | $	$ 2,430
Vested and expected to vest, June 30, 2020 (in shares) | shares	1,677,000
Options exercisable, June 30, 2020 (in Shares) | shares	219,800
Vested and expected to vest, June 30, 2020, Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 11.85
Options exercised, June 30, 2020, Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 2.42

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