Stock-Based Compensation - Stock Options (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended	12 Months Ended
	Jan. 13, 2020	Dec. 31, 2019	Dec. 31, 2019
Stock Options, Additional Disclosures
Granted (in shares)	60,000
2018 Plan
Stock Options, Additional Disclosures
Common stock reserved for issuance (in shares)		1,497,891	1,497,891
2019 Plan
Stock Options, Additional Disclosures
Common stock reserved for issuance (in shares)		3,000,000	3,000,000
Maximum | 2019 Plan
Stock Options, Additional Disclosures
Common stock reserved for issuance (in shares)		6,680,000	6,680,000
Stock options
Stock Options, Additional Disclosures
Granted (in shares)			960,204
Exercised (in shares)			(1,143)
Forfeited/Cancelled (in shares)			(325,784)
Outstanding, Number, Ending Balance (in shares)		633,277	633,277
Vested and exercisable (in shares)		231,478	231,478
Vested and expected to vest (in shares)		267,485	267,485
Granted (in dollars per share)			$ 0.63
Exercise price (in dollars per share)			0.63
Forfeited/Cancelled (in dollars per share)			0.63
Outstanding, Weighted Average Exercise Price, Ending Balance (in dollars per share)		$ 0.63	0.63
Vested and exercisable (in dollars per share)		0.63	0.63
Vested and expected to vest (in dollars per share)		$ 0.63	$ 0.63
Options, Outstanding, Weighted Average Remaining Contractual Term (years)			9 years 1 month 6 days
Vested and exercisable (years)			9 years 1 month 6 days
Vested and expected to vest (years)		9 years 1 month 6 days
Options, Outstanding, Aggregate Intrinsic Value		$ 5,142	$ 5,142
Vested and exercisable		1,880	1,880
Vested and expected to vest		$ 2,172	$ 2,172
Common stock aggregate intrinsic value of exercise price			$ 8.75
Weighted average fair value per share of options granted			$ 0.50