Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2015

Accounting Policies [Abstract]

Schedule of computation of basic and diluted earnings per share attributable to stockholders

The following table sets forth the computation of basic and diluted earnings per share attributable to stockholders (in thousands, except share and per share data):

	Years Ended December 31,
(in thousands, except share and per share data)	2015			2014			2013
Numerator:
Numerator for basic and diluted loss per share:
Net loss	$	(57,246	)	$	(45,722	)	$	(47,889	)
Denominator:
Denominator for basic loss per share:
Weighted average shares	21,993,066			4,239,564			3,996,867
Basic loss per share attributable to ConforMIS, Inc. stockholders	$	(2.60	)	$	(10.78	)	$	(11.98	)
Diluted loss per share attributable to ConforMIS, Inc. stockholders	$	(2.60	)	$	(10.78	)	$	(11.98	)

Schedule of potential shares of common stock equivalents that are antidilutive and not included in the calculation of diluted net loss per share

The following table sets forth potential shares of common stock equivalents that are not included in the calculation of diluted net loss per share because to do so would be anti-dilutive as of the end of each period presented:

	Years Ended December 31,
	2015	2014	2013
Series A Preferred	873,591	1,705,138	1,705,138
Series B Preferred	1,144,885	2,234,668	2,234,668
Series C Preferred	1,256,752	2,453,018	2,453,018
Series D Preferred	3,410,570	6,415,106	6,469,904
Series E-1 Preferred	3,748,578	6,530,429	4,352,976
Series E-2 Preferred	2,628,037	5,129,592	4,181,009
Series C Preferred Warrants	—	56,202	29,735
Series D Preferred Warrants	—	58,365	49,972
Series E-2 Preferred Warrants	—	5,883	25,555
Common stock warrants	303,931	25,733	1,708
Stock options	3,566,421	2,780,631	2,290,768
Total	16,932,765	27,394,765	23,794,451