Schedule I - Condensed Financial Information - Statements of Cash Flows (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2024		Dec. 31, 2023		Dec. 31, 2022
Cash flows from operating activities:
Net loss		$ (43,009)		$ (213,361)		$ (339,567)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Intercompany stock-based compensation expense		114,331		140,931		164,305
Gain on debt extinguishment on note payable		0		0		(23,326)
Accretion, net of amortization		(2,524)		(4,014)		(1,503)
Changes in operating assets and liabilities:
Other assets		2,852		8,859		(8,208)
Accounts payable and accrued expenses		(2,620)		4,739		7,635
Intercompany accrued salaries and benefits		(1,971)		(2,901)		8,784
Net cash provided by (used in) operating activities		34,845		(144,662)		(203,926)
Cash flows from investing activities:
Purchases of short-term investments, available-for-sale, and held-to-maturity securities		(201,241)		(175,567)		(369,396)
Proceeds from sales of short-term investments and available-for-sale securities		83,673		60,436		13,348
Proceeds from maturities of short-term investments and available-for-sale securities		119,689		255,728		472,098
Net cash provided by investing activities		565		140,013		95,133
Cash flows from financing activities:
Issuance of common stock, net of early exercise liability		709		34		1,400
Purchase of treasury stock		(16,491)		(6,220)		(6,362)
Issuance of common stock under employee stock purchase plan, net of stock issuance costs		193		1,116		0
Repurchases of common stock		(1,772)		0		0
Net cash used in financing activities		(17,361)		(5,070)		(4,962)
Net increase (decrease) in cash and cash equivalents		18,049		(9,719)		(113,755)
Cash and cash equivalents, beginning of period		176,494	[1]	186,213	[1]	299,968
Cash and cash equivalents, end of period	[1]	194,543		176,494		186,213
Supplemental disclosure of non-cash investing and financing activities
Activities from Seek Dissolution		0		0		735
Parent Company
Cash flows from operating activities:
Net loss		(43,009)		(213,361)		(339,567)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Intercompany stock-based compensation expense		114,331		140,931		164,305
Gain on debt extinguishment on note payable		0		0		(23,326)
Accretion, net of amortization		(102)		(1,614)		(1,648)
Net realized losses (gains) on investment securities		769		4,321		(6,613)
Changes in operating assets and liabilities:
Other receivables		(24)		0		0
Other assets		394		5,464		(6,339)
Accounts payable and accrued expenses		0		(182)		(334)
Intercompany accrued salaries and benefits		65		22		4,936
Other liabilities		220		0		0
Intercompany payable		20,778		(17,365)		(36,681)
Net cash provided by (used in) operating activities		93,422		(81,784)		(245,267)
Cash flows from investing activities:
Purchases of short-term investments, available-for-sale, and held-to-maturity securities		0		(57,294)		(250,030)
Proceeds from sales of short-term investments and available-for-sale securities		1,507		30,563		3,829
Proceeds from maturities of short-term investments and available-for-sale securities		24,137		173,620		391,643
Investments in consolidated subsidiaries		(3,235)		(81,441)		58,611
Net cash provided by investing activities		22,409		65,448		204,053
Cash flows from financing activities:
Issuance of common stock, net of early exercise liability		709		1,150		1,400
Purchase of treasury stock		(16,490)		(6,220)		(6,362)
Issuance of common stock under employee stock purchase plan, net of stock issuance costs		193		0		0
Repurchases of common stock		(1,772)		0		0
Net cash used in financing activities		(17,360)		(5,070)		(4,962)
Net increase (decrease) in cash and cash equivalents		98,471		(21,406)		(46,176)
Cash and cash equivalents, beginning of period		48,312		69,718		115,894
Cash and cash equivalents, end of period		146,783		48,312		69,718
Supplemental disclosure of non-cash investing and financing activities
Activities from Seek Dissolution		$ 0		$ 0		$ 735

[1] (1) Includes all applicable amounts for both continuing and discontinued operations.