Stock-Based Compensation - Summary of Stock Options Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Options Outstanding, Number of Options, Shares
Options Outstanding, Number of Options, Shares, Beginning Balance	1,867,747
Options Outstanding, Number of Options, Granted, Shares	195,975
Options Outstanding, Number of Options, Exercised, Shares	(487)
Options Outstanding, Number of Options, Cancelled, Shares	(200,666)
Options Outstanding, Number of Options, Shares, Ending Balance	1,862,569	1,867,747
Options Outstanding, Number of Options Exercisable, Shares, as of December 31, 2019	777,147
Options Outstanding, Number of Options, Vested and expected to vest, Shares as of December 31, 2019	1,862,569
Options Outstanding, Weighted Average Exercise Price
Options Outstanding, Weighted Average Exercise Price, Beginning Balance	$ 9.01
Options Outstanding, Weighted Average Exercise Price, Granted	9.49
Options Outstanding, Weighted Average Exercise Price, Exercised	4.14
Options Outstanding, Weighted Average Exercise Price, Cancelled	8.90
Options Outstanding, Weighted Average Exercise Price, Ending Balance	9.09	$ 9.01
Options Outstanding, Weighted Average Exercise Price, Exercisable as of December 31, 2019	8.69
Options Outstanding, Weighted Average Exercise Price, Vested and expected to vest as of December 31, 2019	$ 9.09
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	8 years 7 months 20 days	9 years 7 months 20 days
Options Outstanding, Weighted Average Remaining Contractual Life (Years), Exercisable as of December 31, 2019	8 years 2 months 15 days
Options Outstanding, Weighted Average Remaining Contractual Life (Years), Vested and expected to vest as of December 31, 2019	8 years 7 months 20 days
Options Outstanding, Aggregate Intrinsic Value	$ 99,289	$ 19,573,295
Options Outstanding, Aggregate Intrinsic Value, Exercised	1,630
Options Outstanding, Aggregate Intrinsic Value, Exercisable as of December 31, 2019	93,775
Options Outstanding, Aggregate Intrinsic Value, Vested and expected to vest as of December 31, 2019	$ 99,289