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UNADUDITED CONSOLIDATED STATEMENTS OF CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' DEFECIT - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Increase (Decrease) in Temporary Equity [Roll Forward]
Beginning balance (in shares)	19,074	18,247	19,074	18,247
Beginning balance	$ 182,609	$ 137,686	$ 182,609	$ 137,686
Issuance of convertible preferred stock (in shares)		241		241
Issuance of convertible preferred stock		$ 9,976		$ 9,976
Ending balance	$ 182,609	$ 147,662	$ 182,609	$ 147,662
Ending balance (in shares)	19,074	18,488	19,074	18,488
Increase (Decrease) in Stockholders' Deficit [Roll Forward]
Beginning balance	$ (97,785)	$ (84,773)	$ (80,691)	$ (83,976)
Stock-based compensation	2,907	1,681	$ 5,458	2,835
Stock options exercised (in shares)			500
Stock options exercised	1,277	168	$ 3,307	450
Common stock repurchased and retired			(868)
Options repurchased			(7,335)
Net (loss) income	(176)	40	(13,648)	(2,193)
Ending balance	$ (93,777)	$ (82,884)	$ (93,777)	$ (82,884)
Common Stock
Increase (Decrease) in Stockholders' Deficit [Roll Forward]
Beginning balance (in shares)	13,118	12,456	12,794	12,406
Beginning balance	$ 1	$ 1	$ 1	$ 1
Stock options exercised (in shares)	153	26	500	76
Common stock repurchased and retired (in shares)			(23)
Ending balance (in shares)	13,271	12,482	13,271	12,482
Ending balance	$ 1	$ 1	$ 1	$ 1
Additional Paid-in Capital
Increase (Decrease) in Stockholders' Deficit [Roll Forward]
Beginning balance	26,465	12,462	30,087	11,026
Stock-based compensation	2,907	1,681	5,458	2,835
Stock options exercised	1,277	168	3,307	450
Common stock repurchased and retired			(868)
Options repurchased			(7,335)
Ending balance	30,649	14,311	30,649	14,311
Accumulated Deficit
Increase (Decrease) in Stockholders' Deficit [Roll Forward]
Beginning balance	(124,251)	(97,236)	(110,779)	(95,003)
Net (loss) income	(176)	40	(13,648)	(2,193)
Ending balance	$ (124,427)	$ (97,196)	$ (124,427)	$ (97,196)

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