Consolidated Statements of Stockholders' Equity (Deficit) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings (Accumulated Deficit)	Total Penumbra, Inc. Stockholders’ Equity	Non-controlling Interest
Beginning balance (in shares) at Dec. 31, 2018		34,437,339
Beginning balance at Dec. 31, 2018	$ 422,415	$ 34	$ 415,084	$ (1,942)	$ 9,064	$ 422,240	$ 175
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock (in shares)		140,598
Issuance of common stock	1,071	$ 0	1,071			1,071
Shares held for tax withholdings (in shares)		(14,284)
Shares held for tax withholdings	(2,098)		(2,098)			(2,098)
Stock-based compensation	5,457		5,457			5,457
Other comprehensive income (loss)	(636)			(636)		(636)
Net income (loss)					10,698	10,698
Net loss attributable to non-controlling interest							(244)
Consolidated net (loss) income	10,454
Ending balance (in shares) at Mar. 31, 2019		34,563,653
Ending balance at Mar. 31, 2019	436,663	$ 34	419,514	(2,578)	19,762	436,732	(69)
Beginning balance (in shares) at Dec. 31, 2018		34,437,339
Beginning balance at Dec. 31, 2018	422,415	$ 34	415,084	(1,942)	9,064	422,240	175
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income (loss)	428			428
Net income (loss)	27,286
Net loss attributable to non-controlling interest	(583)
Consolidated net (loss) income	26,703
Ending balance (in shares) at Jun. 30, 2019		34,786,503
Ending balance at Jun. 30, 2019	454,183	$ 35	419,220	(1,514)	36,350	454,091	92
Beginning balance (in shares) at Mar. 31, 2019		34,563,653
Beginning balance at Mar. 31, 2019	436,663	$ 34	419,514	(2,578)	19,762	436,732	(69)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock (in shares)		259,080
Issuance of common stock	1,195	$ 1	1,194			1,195
Issuance of common stock under employee stock purchase plan (in shares)		46,065
Issuance of common stock under employee stock purchase plan	4,779		4,779			4,779
Shares held for tax withholdings (in shares)		82,295
Shares held for tax withholdings	(11,281)		(11,281)			(11,281)
Stock-based compensation	5,014		5,014			5,014
Capital contribution from non-controlling interest	500						500
Other comprehensive income (loss)	1,064			1,064		1,064
Net income (loss)	16,588				16,588	16,588
Net loss attributable to non-controlling interest	(339)						(339)
Consolidated net (loss) income	16,249
Ending balance (in shares) at Jun. 30, 2019		34,786,503
Ending balance at Jun. 30, 2019	454,183	$ 35	419,220	(1,514)	36,350	454,091	92
Beginning balance (in shares) at Dec. 31, 2019		35,001,581
Beginning balance at Dec. 31, 2019	485,613	$ 35	430,659	(2,324)	57,522	485,892	(279)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock (in shares)		81,485
Issuance of common stock	396	$ 0	396			396
Shares held for tax withholdings (in shares)		(12,058)
Shares held for tax withholdings	(2,105)		(2,105)			(2,105)
Stock-based compensation	6,774		6,774			6,774
Other comprehensive income (loss)	(2,251)			(2,251)		(2,251)
Net income (loss)					1,425	1,425
Net loss attributable to non-controlling interest							(537)
Consolidated net (loss) income	888
Ending balance (in shares) at Mar. 31, 2020		35,071,008
Ending balance at Mar. 31, 2020	488,117	$ 35	435,724	(4,575)	57,749	488,933	(816)
Beginning balance (in shares) at Dec. 31, 2019		35,001,581
Beginning balance at Dec. 31, 2019	485,613	$ 35	430,659	(2,324)	57,522	485,892	(279)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income (loss)	227			227
Net income (loss)	(10,535)
Net loss attributable to non-controlling interest	(1,478)
Consolidated net (loss) income	(12,013)
Ending balance (in shares) at Jun. 30, 2020		36,036,410
Ending balance at Jun. 30, 2020	623,161	$ 36	581,066	(2,097)	45,789	624,794	(1,633)
Beginning balance (in shares) at Mar. 31, 2020		35,071,008
Beginning balance at Mar. 31, 2020	488,117	$ 35	435,724	(4,575)	57,749	488,933	(816)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock (in shares)		68,153
Issuance of common stock	791	$ 0	667			667	124
Issuance of common stock under employee stock purchase plan (in shares)		41,590
Issuance of common stock under employee stock purchase plan	5,945		5,945			5,945
Issuance of common stock upon underwritten public offering, net of issuance cost (in shares)		865,963
Issuance of common stock upon underwritten public offering, net of issuance cost	134,759	$ 1	134,758			134,759
Shares held for tax withholdings (in shares)		10,304
Shares held for tax withholdings	(1,768)		(1,768)			(1,768)
Stock-based compensation	5,740		5,740			5,740
Other comprehensive income (loss)	2,478			2,478		2,478
Net income (loss)	(11,960)				(11,960)	(11,960)
Net loss attributable to non-controlling interest	(941)						(941)
Consolidated net (loss) income	(12,901)
Ending balance (in shares) at Jun. 30, 2020		36,036,410
Ending balance at Jun. 30, 2020	$ 623,161	$ 36	$ 581,066	$ (2,097)	$ 45,789	$ 624,794	$ (1,633)