Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Series C Preferred Stock	Series C-1 Preferred Stock	Common Stock	Common Stock Series C Preferred Stock	Common Stock Series C-1 Preferred Stock	Common Stock Series B Preferred Stock	Common Stock March 20, 2019	Common Stock May 17, 2019	Common Stock June 12, 2019	Common Stock August 2019	Common Stock November 2019	Additional Paid-in Capital	Additional Paid-in Capital Series C Preferred Stock	Additional Paid-in Capital Series C-1 Preferred Stock	Accumulated Deficit	Accumulated Other Comprehensive Income/(Loss)
Beginning balance at Dec. 31, 2017	$ 8,154			$ 1									$ 47,393			$ (39,197)	$ (43)
Beginning balance, shares at Dec. 31, 2017				8,575,950
Net loss	(31,823)															(31,823)
Issuance of preferred stock upon conversion of common stock		$ 20,972	$ 6,417											$ 20,972	$ 6,417
Issuance of preferred stock upon conversion of common stock, shares					1,536,602	491,260
Issuance of common stock, shares				897,435			28,478
Issuance of warrants related to debt	929												929
Stock-based compensation	619												619
Exercise of stock options	18												18
Exercise of stock options, shares				4,465
Other comprehensive income	83																83
Ending balance at Dec. 31, 2018	5,369			$ 1									76,348			(71,020)	40
Ending balance, shares at Dec. 31, 2018				11,534,190
Net loss	(58,789)															(58,789)
Issuance of restricted common stock, shares								2,406,618	19,407	64,982	84,975	25,990
Issuance of common stock	29,447			$ 1									29,446
Issuance of common stock, shares				3,600,000
Stock-based compensation	34,681												34,681
Exercise of stock options	$ 2												2
Exercise of stock options, shares	487			487
Other comprehensive income	$ 17																17
Ending balance at Dec. 31, 2019	$ 10,727			$ 2									$ 140,477			$ (129,809)	$ 57
Ending balance, shares at Dec. 31, 2019				17,736,649