Consolidated Statements of Stockholders' Deficit - USD ($) shares in Thousands, $ in Thousands	Total	Convertible Notes The Mann Group L L C	2024 Convertible Notes	2024 Convertible Note Interest	Convertible Note Interest The Mann Group L L C	Common Stock	Common Stock Convertible Notes The Mann Group L L C	Common Stock 2024 Convertible Notes	Common Stock 2024 Convertible Note Interest	Common Stock Convertible Note Interest The Mann Group L L C	Additional Paid-in Capital	Additional Paid-in Capital Convertible Notes The Mann Group L L C	Additional Paid-in Capital 2024 Convertible Notes	Additional Paid-in Capital 2024 Convertible Note Interest	Additional Paid-in Capital Convertible Note Interest The Mann Group L L C	Accumulated Deficit
Beginning Balance at Dec. 31, 2020	$ (180,419)					$ 2,421					$ 2,866,303					$ (3,049,143)
Beginning Balance (in shares) at Dec. 31, 2020						242,118
Net issuance of common stock associated with restricted stock units and stock options	(498)					$ 16					(514)
Net issuance of common stock associated with restricted stock units and stock options (in shares)						1,572
Issuance of common stock under employee stock purchase plan	1,090					$ 5					1,085
Issuance of common stock under employee stock purchase plan (in shares)						527
Stock-based compensation expense	12,200										12,200
Issuance of common stock pursuant to conversion notes		$ 9,573	$ 5,000		$ 427		$ 38	$ 17		$ 2		$ 9,535	$ 4,983		$ 425
Issuance of common stock pursuant to conversion notes (in shares)							3,830	1,667		170
Issuance of common stock pursuant to payoff of the 2024 convertible note interest				$ 143										$ 143
Issuance of common stock pursuant to payoff of the 2024 convertible note interest (in shares)									27
Issuance of at-the-market offering	1,886					$ 6					1,880
Issuance of at-the-market offering (in shares)						578
Issuance costs associated with at-the-market offering	(38)										(38)
Premium on Mann Group convertible note	22,107										22,107
Issuance of common stock from market price stock purchase	106										106
Issuance of common stock from market price stock purchase (in shares)						25
Issuance of common stock pursuant to a warrant conversion						$ 10					(10)
Issuance of common stock pursuant to a warrant conversion (shares)						964
Net loss	(80,926)															(80,926)
Ending Balance at Dec. 31, 2021	(209,349)					$ 2,515					2,918,205					(3,130,069)
Ending Balance (in shares) at Dec. 31, 2021						251,478
Net issuance of common stock associated with restricted stock units and stock options	319					$ 22					297
Net issuance of common stock associated with restricted stock units and stock options (in shares)						2,242
Issuance of common stock under employee stock purchase plan	2,082					$ 6					2,076
Issuance of common stock under employee stock purchase plan (in shares)						686
Stock-based compensation expense	13,447										13,447
Issuance of common stock pursuant to conversion notes		$ 9,596			674		$ 39			$ 2		$ 9,557			672
Issuance of common stock pursuant to conversion notes (in shares)							3,838			237
Issuance of at-the-market offering	19,790					$ 51					19,739
Issuance of at-the-market offering (in shares)						5,060
Issuance costs associated with at-the-market offering	(381)										(381)
Issuance of common stock from market price stock purchase	684					$ 3					681
Issuance of common stock from market price stock purchase (in shares)						252
Net loss	(87,400)															(87,400)
Ending Balance at Dec. 31, 2022	(250,538)					$ 2,638					2,964,293					(3,217,469)
Ending Balance (in shares) at Dec. 31, 2022						263,793
Net issuance of common stock associated with restricted stock units and stock options	(10,162)					$ 41					(10,203)
Net issuance of common stock associated with restricted stock units and stock options (in shares)						4,169
Issuance of common stock under employee stock purchase plan	1,668					$ 5					1,663
Issuance of common stock under employee stock purchase plan (in shares)						507
Stock-based compensation expense	17,649										17,649
Issuance of common stock pursuant to conversion notes					$ 222					$ 1					$ 221
Issuance of common stock pursuant to conversion notes (in shares)										51
Issuance of at-the-market offering	6,887					$ 15					6,872
Issuance of at-the-market offering (in shares)						1,478
Issuance costs associated with at-the-market offering	(108)										(108)
Issuance of common stock from market price stock purchase	152										152
Issuance of common stock from market price stock purchase (in shares)						36
Net loss	(11,938)															(11,938)
Ending Balance at Dec. 31, 2023	$ (246,168)					$ 2,700					$ 2,980,539					$ (3,229,407)
Ending Balance (in shares) at Dec. 31, 2023						270,034