Summary of Significant Accounting Policies - Expenses and Net Loss Per Share (Details) $ / shares in Units, $ in Thousands			3 Months Ended
		Oct. 26, 2022	Mar. 31, 2023 USD ($) $ / shares shares	Mar. 31, 2022 USD ($) $ / shares shares
Numerator for basic and diluted loss per share:
Net loss, basic | $			$ (9,571)	$ (16,031)
Net loss, diluted | $			$ (9,571)	$ (16,031)
Denominator:
Basic weighted average shares (in shares) | shares	[1]		7,253,645	7,167,171
Diluted weighted average shares (in shares) | shares	[1]		7,253,645	7,167,171
Loss per share attributable to Conformis, Inc. stockholders: basic (in dollars per share) | $ / shares	[1]		$ (1.32)	$ (2.24)
Loss per share attributable to Conformis, Inc. stockholders: diluted (in dollars per share) | $ / shares	[1]		$ (1.32)	$ (2.24)
Stock split, conversion ratio		0.04	0.04	0.04

[1] *Adjusted for the 1-for-25 reverse stock split