Stockholders' Equity (Deficit) - Acquisition Transactions (Details)	Dec. 07, 2015 $ / shares shares	Sep. 30, 2016 $ / shares shares	Dec. 31, 2015 $ / shares shares
Significant Transaction
Common stock, par value per share (in dollars per share) | $ / shares		$ 0.001	$ 0.001
Preferred stock, shares issued | shares		0	0
Preferred stock, shares outstanding | shares		0	0
Senseonics Reverse Merger Agreement | Common Stock | Common Shares Exchanged in Reverse Capitalization
Significant Transaction
Common stock, par value per share (in dollars per share) | $ / shares	$ 0.001
Shares issued | shares	1,955,929
Senseonics Reverse Merger Agreement | Common Stock | Common Stock, Senseonics, Inc.
Significant Transaction
Common stock, par value per share (in dollars per share) | $ / shares	$ 0.01
Senseonics Reverse Merger Agreement | Common Stock | Common Stock, Senseonics, Inc. | Common Shares Exchanged in Reverse Capitalization
Significant Transaction
Exchange ratio	2.0975
Senseonics Reverse Merger Agreement | Common Stock | Preferred Stock, Senseonics, Inc. | Common Shares Exchanged in Reverse Capitalization
Significant Transaction
Common stock, par value per share (in dollars per share) | $ / shares	$ 0.001
Shares issued | shares	55,301,674