Consolidated Statements of Stockholders' Equity - USD ($)	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	AOCI Attributable to Parent [Member]	Total
Balances at Dec. 31, 2017	$ 51,000	$ 145,639,000	$ (121,340,000)	$ (7,000)	$ 24,343,000
Balances (in shares) at Dec. 31, 2017	5,073,669
Grant of restricted stock awards (in shares)	12,331
Forfeiture of restricted stock awards (in shares)	(17,453)
Stock-based compensation		39,000			39,000
Net loss			(12,830,000)		(12,830,000)
Unrealized gain on available-for-sale securities				7,000	7,000
Balances at Jun. 30, 2018	$ 51,000	145,678,000	(134,170,000)		11,559,000
Balances (in shares) at Jun. 30, 2018	5,068,547
Balances at Mar. 31, 2018	$ 51,000	145,665,000	(131,003,000)	(7,000)	14,706,000
Balances (in shares) at Mar. 31, 2018	5,082,177
Forfeiture of restricted stock awards (in shares)	(13,630)
Stock-based compensation		13,000			13,000
Net loss			(3,167,000)		(3,167,000)
Unrealized gain on available-for-sale securities				$ 7,000	7,000
Balances at Jun. 30, 2018	$ 51,000	145,678,000	(134,170,000)		11,559,000
Balances (in shares) at Jun. 30, 2018	5,068,547
Balances at Dec. 31, 2018	$ 51,000	145,685,000	(138,042,000)		7,694,000
Balances (in shares) at Dec. 31, 2018	5,069,633
Forfeiture of restricted stock awards (in shares)	(8,467)
Issuance of common stock and conversion of deferred consideration for asset acquisition	$ 5,000	1,457,000			1,462,000
Issuance of common stock and conversion of deferred consideration for asset acquisition (in shares)	516,976
Issuance of common stock in connection with reverse merger	$ 23,000	10,687,000	2,000		10,712,000
Issuance of common stock in connection with reverse merger (in shares)	2,389,135
Sale of common stock, net of issuance costs	$ 20,000	9,955,000			9,975,000
Sale of common stock, net of issuance costs (in shares)	1,991,269
Stock-based compensation		725,000			725,000
Net loss			(7,938,000)		(7,938,000)
Balances at Jun. 30, 2019	$ 99,000	168,509,000	(145,978,000)		22,630,000
Balances (in shares) at Jun. 30, 2019	9,958,546
Balances at Mar. 31, 2019	$ 51,000	145,685,000	(141,781,000)		3,955,000
Balances (in shares) at Mar. 31, 2019	5,069,633
Forfeiture of restricted stock awards (in shares)	(8,467)
Issuance of common stock and conversion of deferred consideration for asset acquisition	$ 5,000	1,457,000			1,462,000
Issuance of common stock and conversion of deferred consideration for asset acquisition (in shares)	516,976
Issuance of common stock in connection with reverse merger	$ 23,000	10,687,000	2,000		10,712,000
Issuance of common stock in connection with reverse merger (in shares)	2,389,135
Sale of common stock, net of issuance costs	$ 20,000	9,955,000			9,975,000
Sale of common stock, net of issuance costs (in shares)	1,991,269
Stock-based compensation		725,000			725,000
Net loss			(4,199,000)		(4,199,000)
Balances at Jun. 30, 2019	$ 99,000	$ 168,509,000	$ (145,978,000)		$ 22,630,000
Balances (in shares) at Jun. 30, 2019	9,958,546