Revenue Recognition - Summary of Revenues Classified by Major Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended					9 Months Ended		12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Jun. 30, 2021	Jun. 30, 2020	Sep. 30, 2020
Revenues:
Total net revenues	$ 96,801	$ 93,643	$ 75,197	$ 86,823	$ 77,705	$ 289,106	$ 239,725	$ 330,967
United States
Revenues:
Total net revenues	31,632		27,969			100,507	99,907
Other Americas
Revenues:
Total net revenues	37		8			105	16
Germany
Revenues:
Total net revenues	24,519		21,082			81,230	61,401
Other Europe, Middle East and Africa
Revenues:
Total net revenues	10,574		6,868			27,239	20,093
Japan
Revenues:
Total net revenues	19,032		11,727			45,484	38,656
Other Asia-Pacific
Revenues:
Total net revenues	$ 11,007		$ 7,543			$ 34,541	$ 19,652