Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit
Beginning Balance at Dec. 31, 2017	$ 17,676	$ 1	$ 55,750	$ (38,075)
Beginning Balance, Shares at Dec. 31, 2017		10,000
Investment from MegaChips	1,850		1,850
Stock-based compensation expense	831		831
Net income (loss)	(9,342)			(9,342)
Ending Balance at Dec. 31, 2018	$ 11,015	$ 1	58,431	(47,417)
Ending Balance, Shares at Dec. 31, 2018	10,000,000	10,000
Stock-based compensation expense	$ 1,379		1,379
Net income (loss)	(6,607)			(6,607)
Issuance of common stock upon initial public offering net of underwriting discounts and commissions and other offering costs	56,353	$ 1	56,352
Issuance of common stock upon initial public offering net of underwriting discounts and commissions and other offerings costs, Shares		4,945
Common stock issued in connection with vesting of restricted stock units, Shares		23
Ending Balance at Dec. 31, 2019	$ 62,140	$ 2	$ 116,162	$ (54,024)
Ending Balance, Shares at Dec. 31, 2019	14,968,000	14,968