CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Accumulated Other Comprehensive Loss	Accumulated Deficit
Balance at Dec. 28, 2019	$ 54,649	$ 424,134	$ (2)	$ (369,483)
Balance, Shares at Dec. 28, 2019		21,184,524
Issuance of common stock upon the exercise of common stock options	227	$ 227
Issuance of common stock upon the exercise of common stock options, Shares		218,084
Issuance of common stock in connection with employee stock purchase plan	357	$ 357
Issuance of common stock in connection with employee stock purchase plan, Shares		22,697
Issuance of common stock in public offering, net of discounts and issuance costs	75,085	$ 75,085
Issuance of common stock in public offering, net of discounts and issuance costs, Shares		5,750,000
Stock-based compensation expense	2,414	$ 2,414
Foreign currency translation adjustment	(49)		(49)
Unrealized gains (losses) on marketable securities	(44)		(44)
Net loss	(28,748)			(28,748)
Balance at Dec. 31, 2020	103,891	$ 502,217	(95)	(398,231)
Balance, Shares at Dec. 31, 2020		27,175,305
Issuance of common stock upon the exercise of common stock options	974	$ 974
Issuance of common stock upon the exercise of common stock options, Shares		588,461
Issuance of common stock in connection with employee stock purchase plan	419	$ 419
Issuance of common stock in connection with employee stock purchase plan, Shares		27,849
Stock-based compensation expense	6,878	$ 6,878
Foreign currency translation adjustment	(46)		(46)
Unrealized gains (losses) on marketable securities	(47)		(47)
Net loss	(44,215)			(44,215)
Balance at Dec. 31, 2021	67,854	$ 510,488	(188)	(442,446)
Balance, Shares at Dec. 31, 2021		27,791,615
Issuance of common stock upon the exercise of common stock options	$ 4,667	$ 4,667
Issuance of common stock upon the exercise of common stock options, Shares	507,795	507,795
Issuance of common stock in connection with employee stock purchase plan	$ 509	$ 509
Issuance of common stock in connection with employee stock purchase plan, Shares		30,143
Issuance of common stock in public offering, net of discounts and issuance costs	139,854	$ 139,854
Issuance of common stock in public offering, net of discounts and issuance costs, Shares		3,737,500
Issuance of restricted common stock, Shares		26,093
Restricted common stock forfeitures, Shares		(1,778)
Issuance of common stock in connection with exercise of warrants	438	$ 438
Issuance of common stock in connection with exercise of warrants, Shares		50,000
Stock-based compensation expense	10,321	$ 10,321
Foreign currency translation adjustment	(73)		(73)
Unrealized gains (losses) on marketable securities	36		36
Net loss	(36,231)			(36,231)
Balance at Dec. 31, 2022	$ 187,375	$ 666,277	$ (225)	$ (478,677)
Balance, Shares at Dec. 31, 2022		32,141,368