Unaudited Condensed Consolidated Statement of Changes in Stockholders’ Equity (Deficit) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings
Balance (shares) at Dec. 31, 2019		86,762,463
Balance at Dec. 31, 2019	$ (18,069)	$ 9	$ 30,888	$ (48,966)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation	57		57
Net loss	(5,562)			(5,562)
Balance (shares) at Mar. 31, 2020		86,762,463
Balance at Mar. 31, 2020	(23,574)	$ 9	30,945	(54,528)
Balance (shares) at Dec. 31, 2019		86,762,463
Balance at Dec. 31, 2019	(18,069)	$ 9	30,888	(48,966)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(18,667)
Balance (shares) at Sep. 30, 2020		87,874,623
Balance at Sep. 30, 2020	(36,452)	$ 9	31,172	(67,633)
Balance (shares) at Mar. 31, 2020		86,762,463
Balance at Mar. 31, 2020	(23,574)	$ 9	30,945	(54,528)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of common stock options and vesting of restricted stock units (shares)		234,057
Exercise of common stock options and vesting of restricted stock units	25		25
Share-based compensation	34		34
Net loss	(4,001)			(4,001)
Balance (shares) at Jun. 30, 2020		86,996,520
Balance at Jun. 30, 2020	(27,516)	$ 9	31,004	(58,529)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of common stock options and vesting of restricted stock units (shares)		878,103
Exercise of common stock options and vesting of restricted stock units	94		94
Share-based compensation	74		74
Net loss	(9,104)			(9,104)
Balance (shares) at Sep. 30, 2020		87,874,623
Balance at Sep. 30, 2020	(36,452)	$ 9	31,172	(67,633)
Balance (shares) at Dec. 31, 2020		169,316,421
Balance at Dec. 31, 2020	640,168	$ 19	364,998	275,151
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued for warrants exercised, net of issuance costs (shares)		371,535
Common stock issued for warrants exercised, net of issuance costs	4,282		4,282
Exercise of common stock options and vesting of restricted stock units (shares)		1,831,855
Exercise of common stock options and vesting of restricted stock units	287		287
Share-based compensation	1,510		1,510
Net loss	(16,562)			(16,562)
Balance (shares) at Mar. 31, 2021		171,519,811
Balance at Mar. 31, 2021	629,685	$ 19	371,077	258,589
Balance (shares) at Dec. 31, 2020		169,316,421
Balance at Dec. 31, 2020	640,168	$ 19	364,998	275,151
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(66,421)
Balance (shares) at Sep. 30, 2021		173,120,988
Balance at Sep. 30, 2021	582,554	$ 20	373,804	208,730
Balance (shares) at Mar. 31, 2021		171,519,811
Balance at Mar. 31, 2021	629,685	$ 19	371,077	258,589
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of common stock options and vesting of restricted stock units (shares)		1,278,527
Exercise of common stock options and vesting of restricted stock units	216	$ 1	215
Share-based compensation	1,917		1,917
Net loss	(23,244)			(23,244)
Balance (shares) at Jun. 30, 2021		172,798,338
Balance at Jun. 30, 2021	608,574	$ 20	373,209	235,345
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of common stock options and vesting of restricted stock units (shares)		322,650
Exercise of common stock options and vesting of restricted stock units	50		50
Share-based compensation	545		545
Net loss	(26,615)			(26,615)
Balance (shares) at Sep. 30, 2021		173,120,988
Balance at Sep. 30, 2021	$ 582,554	$ 20	$ 373,804	$ 208,730