Condensed Consolidated Statements of Convertible Preferred Stock and Stockholders' Equity (Deficit) (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Convertible Preferred Stock
Balance at Dec. 31, 2019	$ (49,571)	$ 10	$ 4,632	$ (54,213)
Balance, shares at Dec. 31, 2019					33,645,447
Balance at Dec. 31, 2019					$ 69,114
Balance, shares at Dec. 31, 2019		10,091,100
Stock-based compensation expense	189		189
Net income (loss)	(3,988)			(3,988)
Balance at Mar. 31, 2020	(53,370)	$ 10	4,821	(58,201)
Balance, shares at Mar. 31, 2020					33,645,447
Balance at Mar. 31, 2020					$ 69,114
Balance, shares at Mar. 31, 2020		10,091,100
Balance at Dec. 31, 2020	547,801	$ 82	612,879	(65,160)
Balance, shares at Dec. 31, 2020		82,436,937
Issuance of common stock upon exercise of stock options	471	$ 1	470
Issuance of common stock upon exercise of stock options, shares		300,000
Stock-based compensation expense	7,273		7,273
Net income (loss)	30,713			30,713
Balance at Mar. 31, 2021	$ 586,258	$ 83	$ 620,622	$ (34,447)
Balance, shares at Mar. 31, 2021		82,736,937