Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		12 Months Ended			31 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2025
Cash flows from operating activities:
Net loss			$ (66,539)	$ (6,020)	$ (12,148)
Adjustments to reconcile net (loss) income to net cash provided by (used in) operating activities:
Depreciation and amortization			7,579	7,212	6,048
Amortization of operating lease-right-of use assets			4,396	3,278	3,182
Provision for (benefit from) credit losses			413	(64)	269
Stock-based compensation			24,585	26,848	22,048
Loss on disposal of property and equipment			415	55	7
Provision for excess and obsolete inventory			1,703	1,646	1,468
Deferred income taxes			33,557	(2,886)	0
Gain on investments, accretion, and amortization, net			(5,673)	(5,211)	(6,661)
Interest expenses for accretion of the legal settlement liabilities			(328)	(7,192)	1,577
Change in operating assets and liabilities:
Trade accounts receivable			368	(5,428)	(7,332)
Inventories			(5,244)	14,755	4,286
Prepaid expenses and other assets			(2,658)	(2,809)	(9,515)
Trade accounts payable			448	2,582	(1,784)
Accrued expenses and other liabilities			3,970	(817)	729
Legal settlement liabilities			(1,133)	(1,105)	(298)
Deferred revenue			3,601	3,737	6,520
Lease liabilities			(4,146)	(3,202)	(3,115)
Net cash provided by (used in) operating activities			(4,686)	25,379	5,281
Cash flows from investing activities:
Purchases of marketable securities			(278,155)	(274,062)	(175,935)
Maturities of marketable securities			292,211	195,000	132,000
Purchase of property and equipment			(4,084)	(3,525)	(4,648)
Proceeds from sales of property and equipment			252	288	0
Acquisition of business			0	(471)	(44,896)
Purchase of intangible assets (patents)			(106)	(204)	(179)
Payment for additional investment in Cytek Japan, net of cash acquired			0	0	(236)
Net cash provided by (used in) investing activities			10,117	(82,974)	(93,894)
Cash flows from financing activities:
Proceeds from line of credit			5,582	4,181	0
Payment for repurchase of shares	$ (7,000)	$ (34,600)	(15,074)	(21,611)	(44,151)	$ (80,800)
Repayment of loan			(4,745)	(557)	(565)
Proceeds from Employee Stock Purchase Plan			1,149	1,704	1,855
Payments for taxes related to net share settlement of equity awards			(670)	(554)	(419)
Proceeds from issuance of common stock under employee stock plans			325	1,015	1,468
Net cash used in financing activities			(13,432)	(15,822)	(41,812)
Effect of exchange rate changes on cash, cash equivalents and restricted cash			109	4,532	(1,445)
Cash, cash equivalents and restricted cash:
Net decrease in cash, cash equivalents and restricted cash			(7,892)	(68,885)	(131,870)
Cash, cash equivalents and restricted cash at beginning of period			98,745	167,630	299,500
Cash, cash equivalents and restricted cash at end of period	98,745	167,630	90,853	98,745	167,630	90,853
Supplemental disclosure of cash flow information:
Cash paid for taxes, net of refunds			2,159	3,828	5,305
Non-cash investing and financing activities:
Fixed asset purchases in accounts payable at period end			129	177	40
Intangible asset in accrued expenses at period end			26	0	510
Accrued excise taxes for share repurchase			0	0	320
Derecognition of right-of-use assets			0	205	0
Transfer of inventory to property and equipment			122	0	0
Operating Lease Right-of-use assets obtained in exchange for operating lease liabilities			5,038	2,716	0
Holdback amount in business acquisition	$ 100	$ 0	$ 0	$ 100	$ 0	$ 0