Unaudited Condensed Consolidated Statement of Stockholders' Equity - USD ($) $ in Thousands	Total	Class B Units	Common Stock	Additional Paid-In Capital	Accumulate Deficit
Beginning balance at Dec. 31, 2019	$ (56,011)			$ 2,295	$ (148,354)
Net loss	(7,826)				(7,826)
Ending balance at Jun. 30, 2020	(63,837)			2,295	(156,180)
Beginning balance at Mar. 31, 2020	(57,615)			2,295	(149,958)
Net loss	(6,222)				(6,222)
Ending balance at Jun. 30, 2020	(63,837)			2,295	(156,180)
Beginning balance at Dec. 31, 2020	209,974		$ 3	300,888	(90,917)
Beginning balance, share at Dec. 31, 2020		1,492,059	32,171,560
Stock-based compensation expense	16,941			16,941
Issuance of common stock under equity incentive plans, share			138,461
Issuance of common stock for Employee Stock Purchase Plan	190			190
Issuance of common stock for Employee Stock Purchase Plan, share			5,280
Net loss	(49,082)			0	(49,082)
Ending balance at Jun. 30, 2021	178,023	$ 0	$ 3	318,019	(139,999)
Ending balance, share at Jun. 30, 2021		1,492,059	32,315,301
Beginning balance at Mar. 31, 2021	195,916		$ 3	305,531	(109,618)
Beginning balance, share at Mar. 31, 2021		1,492,059	32,171,560
Stock-based compensation expense	12,298			12,298
Issuance of common stock under equity incentive plans, share			138,461
Issuance of common stock for Employee Stock Purchase Plan	190			190
Issuance of common stock for Employee Stock Purchase Plan, share			5,280
Net loss	(30,381)			0	(30,381)
Ending balance at Jun. 30, 2021	$ 178,023	$ 0	$ 3	$ 318,019	$ (139,999)
Ending balance, share at Jun. 30, 2021		1,492,059	32,315,301