Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - 9 months ended Sep. 30, 2018 - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income [Member]
Beginning balances at Dec. 31, 2017	$ 119,309	$ 32	$ 186,522	$ (68,203)	$ 958
Beginning balance, shares at Dec. 31, 2017		30,509,522
Issuance of common stock upon public offering, net	45,792	$ 4	45,788
Issuance of common stock upon public offering, net, shares		4,250,000
Issuance of common stock upon At The Market sales, net	493		493
Issuance of common stock upon At The Market sales, net, shares		46,900
Issuance of common stock for settlement of RSUs, shares		37,500
Net issuance of common stock upon cashless exercise of stock options		115,754
Issuance of common stock upon exercise of stock options	50		50
Issuance of common stock upon exercise of stock options, shares		51,162
Issuance of common stock upon exercise of warrants	19		19
Issuance of common stock upon exercise of warrants, Shares		2,123
Common stock issued for purchase of assets	995		995
Common stock issued for purchase of assets, shares		107,579
Stock-based compensation	2,792		2,792
Foreign exchange translation adjustment	(620)				(620)
Unrealized gain on short-term investments	26				26
Net loss incurred	(51,002)			(51,002)
Ending balance at Sep. 30, 2018	$ 117,854	$ 36	$ 236,659	$ (119,205)	$ 364
Ending balance, shares at Sep. 30, 2018		35,120,540