Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Revenue:	$ 149,368	$ 98,424	$ 50,691
Transferred over Time
Disaggregation of Revenue [Line Items]
Revenue:	71,987	50,414	38,240
Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Revenue:	77,381	48,010	12,451
Platform
Disaggregation of Revenue [Line Items]
Revenue:	144,446	92,764	45,121
Platform | Transferred over Time
Disaggregation of Revenue [Line Items]
Revenue:	67,065	44,754	32,670
Platform | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Revenue:	77,381	48,010	12,451
Professional services and other
Disaggregation of Revenue [Line Items]
Revenue:	4,922	5,660	5,570
Professional services and other | Transferred over Time
Disaggregation of Revenue [Line Items]
Revenue:	4,922	5,660	5,570
Professional services and other | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Revenue:	$ 0	$ 0	$ 0