Stockholders’ Equity and Stock-Based Compensation - Narrative (Details) - USD ($)					1 Months Ended	2 Months Ended	3 Months Ended
	May 12, 2021	Mar. 23, 2021	Jan. 25, 2021	Jan. 12, 2021	Jan. 31, 2021	Sep. 30, 2021	Dec. 31, 2020	Aug. 31, 2020
Class of Stock [Line Items]
Number of shares issued (in shares)			38,333,352	33,368,851	6,298,152	2,256,000	27,025,384
Average share price (in dollars per share)			$ 6.00	$ 3.05	$ 2.68	$ 6.15	$ 0.82
Gross proceeds			$ 230,000,000	$ 101,800,000	$ 16,900,000	$ 13,900,000	$ 22,100,000
Offering costs			$ 435,000	$ 293,000	$ 422,000	$ 600,000	$ 573,000
Authorized amount of stock to be issued								$ 125,000,000
RSUs | R. Erik Holmlin
Class of Stock [Line Items]
Units granted (in shares)	580,000
RSUs | R. Erik Holmlin | Time-Based Vesting
Class of Stock [Line Items]
Units granted (in shares)	290,000
Percentage of shares vesting on the first and second anniversary	50.00%
Vesting period, termination of employment	18 months
RSUs | R. Erik Holmlin | Performance Satisfaction Vesting
Class of Stock [Line Items]
Units granted (in shares)	290,000
RSUs | R. Erik Holmlin | Performance Satisfaction Vesting | Maximum
Class of Stock [Line Items]
Vesting period, termination of employment	4 years
RSUs | R. Erik Holmlin | Performance Satisfaction Vesting | Minimum
Class of Stock [Line Items]
Vesting period, termination of employment	18 months
RSUs | Mark Oldakowski
Class of Stock [Line Items]
Units granted (in shares)	240,000
RSUs | Mark Oldakowski | Time-Based Vesting
Class of Stock [Line Items]
Percentage of shares vesting on the first and second anniversary	50.00%
Cowen
Class of Stock [Line Items]
Aggregate offering price		$ 350,000,000
Commission fee		3.00%
Over-Allotment Option
Class of Stock [Line Items]
Number of shares issued (in shares)			5,000,002	4,352,458
Average share price (in dollars per share)			$ 5.64	$ 2.867
Common Stock
Class of Stock [Line Items]
Authorized amount of stock to be issued								$ 40,000,000