Consolidated Statements Of Changes In Stockholders' Equity (Deficit) - USD ($) $ in Thousands	Total	Common Stock [Member] Common Class A [Member]	Common Stock [Member] Common Class B [Member]	Additional Paid-in Capital [Member] Common Class A [Member]	Additional Paid-in Capital [Member] Common Class B [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Loss, Net [Member]	Accumulated Deficit [Member]
Beginning balance, value at Dec. 31, 2018	$ 290,739	$ 155		$ 2,735,125			$ (73,177)	$ (2,371,364)
Beginning balance, shares at Dec. 31, 2018		154,885,418
Net income (loss)	(255,721)							(255,721)
Foreign currency translation adjustment	1,250						1,250
Purchases of treasury stock	(4,290)					$ 4,290
Stock-based compensation expense, net of forfeitures	18,459			18,459
Transactions under stock plans	(1,675)	$ 2		(1,677)
Transactions under stock plans, shares		1,187,961
Shares issued under Employee Stock Purchase Plan, value	811			811
Shares issued under Employee Stock Purchase Plan, shares		532,292
1-for-10 Reverse Stock Split		$ (141)		141
1-for-10 Reverse Stock Split, shares		140,916,208
Ending balance, value at Dec. 31, 2019	49,573	$ 16		2,752,859		(4,290)	(71,927)	(2,627,085)
Ending balance, shares at Dec. 31, 2019		15,689,463
Net income (loss)	(396,230)							(396,230)
Foreign currency translation adjustment	3,980						3,980
Stock-based compensation expense, net of forfeitures	4,238			4,238
Transactions under stock plans	(208)			(208)
Transactions under stock plans, shares		109,855
Ending balance, value at Dec. 31, 2020	(338,647)	$ 16		2,756,889		(4,290)	(67,947)	(3,023,315)
Ending balance, shares at Dec. 31, 2020		15,799,318
Net income (loss)	268,777							268,777
Foreign currency translation adjustment	67,947						$ 67,947
Stock-based compensation expense, net of forfeitures	935			935
Common stock issued,shares		19,995,581
Common stock issued,value	902,686	$ 200		902,486
Stock Withheld and Retired Shares		(14,701)
Extinguishment of unrecognized compensation expense	988			988
Restricted stock units vested		48,903
Stockholders' Equity, Other Shares		(15,833,520)
Stockholders' Equity, Other		$ (16)		(2,758,812)		$ 4,290		2,754,538
Ending balance, value at Feb. 02, 2021	902,686	$ 200		902,486
Ending balance, shares at Feb. 02, 2021		19,995,581
Net income (loss)	(162,178)							(162,178)
Foreign currency translation adjustment	0
Stock-based compensation expense, net of forfeitures	2,710				$ 2,710
Common stock issued,shares		3,114	113,840
Common stock issued,value			$ 1		(1)
Stock Withheld and Retired Shares			(37,571)
Stock Withheld and Retired Value	(1,485)				(1,485)
Ending balance, value at Dec. 31, 2021	$ 741,733	$ 200	$ 1	$ 902,486	$ 1,224			$ (162,178)
Ending balance, shares at Dec. 31, 2021		19,998,695	76,269