Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Common Stock March 20, 2019	Common Stock May 17, 2019	Common Stock June 12, 2019	Additional Paid-in Capital	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	(18,106)						(18,106)
Issuance of 5,992,750 shares of series C preferred stock in April 2018 which converted at 0.2564 per share into 1,536,602 shares of common stock as part of the Merger (see Note 1)	20,989					20,989
Issuance of common stock upon conversion of preferred stock		1,536,602,000
Stock-based compensation	341					341
Exercise of stock options	18					18
Exercise of stock options, shares		4,465
Other comprehensive income	76							76
Ending balance at Jun. 30, 2018	11,472	$ 1				68,741	(57,303)	33
Ending balance, shares at Jun. 30, 2018		10,117,017
Beginning balance at Mar. 31, 2018	(795)	$ 1				47,557	(48,368)	15
Beginning balance, shares at Mar. 31, 2018		8,575,950
Net loss	(8,935)						(8,935)
Issuance of 5,992,750 shares of series C preferred stock in April 2018 which converted at 0.2564 per share into 1,536,602 shares of common stock as part of the Merger (see Note 1)	20,989					20,989
Issuance of common stock upon conversion of preferred stock		1,536,602,000
Stock-based compensation	177					177
Exercise of stock options	18					18
Exercise of stock options, shares		4,465
Other comprehensive income	18							18
Ending balance at Jun. 30, 2018	11,472	$ 1				68,741	(57,303)	33
Ending balance, shares at Jun. 30, 2018		10,117,017
Beginning balance at Dec. 31, 2018	5,369	$ 1				76,348	(71,020)	40
Beginning balance, shares at Dec. 31, 2018		11,534,190
Net loss	(16,014)						(16,014)
Issuance of restricted common stock				$ 19,407
Issuance of restricted common stock, shares			2,406,618		64,982
Issuance of common stock	29,628	$ 1				29,627
Issuance of stock, shares		3,600,000
Stock-based compensation	$ 4,119					4,119
Exercise of stock options, shares	44	44
Other comprehensive income	$ 13							13
Ending balance at Jun. 30, 2019	23,115	$ 2				110,094	(87,034)	53
Ending balance, shares at Jun. 30, 2019		17,625,241
Beginning balance at Mar. 31, 2019	(1,495)	$ 1				77,848	(79,409)	65
Beginning balance, shares at Mar. 31, 2019		13,940,808
Net loss	(7,625)						(7,625)
Issuance of restricted common stock				$ 19,407
Issuance of restricted common stock, shares					64,982
Issuance of common stock	29,628	$ 1				29,627
Issuance of stock, shares		3,600,000
Stock-based compensation	2,619					2,619
Exercise of stock options, shares		44
Other comprehensive income	(12)							(12)
Ending balance at Jun. 30, 2019	$ 23,115	$ 2				$ 110,094	$ (87,034)	$ 53
Ending balance, shares at Jun. 30, 2019		17,625,241