Stock Options - Restricted Stock Units (Details) - Unvested restricted stock units - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended		12 Months Ended
	Jan. 31, 2020	Jul. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Share-based awards
Vesting period	4 years	2 years
Number of Shares
Unvested at beginning of period (in shares)	447,336		447,336
Granted (in shares)	324,932		361,932
Vested (in shares)			0
Forfeited (in shares)			(92,501)
Unvested at end of period (in shares)			716,767	447,336
Weighted Average Remaining Contractual Term and Aggregate Intrinsic Value
Weighted-average remaining contractual term			1 year	1 year 6 months
Aggregate intrinsic value (in dollars)			$ 19,073	$ 2,564
Weighted-Average Grant Date Fair Value
Unvested at beginning of period (in dollars per share)	$ 4.00		$ 4.00
Granted (in dollars per share)			8.14
Vested (in dollars per share)			0
Forfeited (in dollars per share)			4.68
Unvested at end of period (in dollars per share)			$ 6.00	$ 4.00