Earnings Per Share - Anti-Dilutive Common Stock Equivalents Summary (Details) - $ / shares	9 Months Ended
	Sep. 30, 2020	Sep. 29, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of options (in shares)	698,980	593,680
Exercise price of options lower limit (in dollars per share)	$ 2.36	$ 7.65
Exercise price of options upper limit (in dollars per share)	12.58	$ 12.58
Warrants (in shares)		142,185
Exercise price of warrants lower limit (in dollars per share)		$ 3.33
Exercise price of warrants upper limit (in dollars per share)	$ 11.88	$ 11.88
Warrants for Underwriters
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of EPS (in shares)	141,000	141,000