Stockholders’ Equity (Details) - USD ($) $ / shares in Units, $ in Thousands				3 Months Ended
	Feb. 12, 2018	Mar. 15, 2017	Sep. 08, 2016	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Common Stock
Common Stock, share issued				14,232,313		10,633,042
Issuance of common stock from private placement (shares)				3,592,858
Gross proceeds				$ 25,150
Issuance costs of offering				$ 2,093
Follow On Offering
Common Stock
Issuance of common stock from private placement (shares)	3,142,858
Share price (in dollars per share)	$ 7.00
Net proceeds	$ 23,100
Private placement
Common Stock
Issuance of common stock from private placement (shares)		1,324,256
Price per issue and sold units		$ 9.47
Gross proceeds		$ 12,500			$ 8,979
Number of shares per unit		1
Number of warrants per unit		0.75
Issuance costs of offering					$ 1,219
Net proceeds		$ 11,200
Overallotment
Common Stock
Issuance of common stock from private placement (shares)	450,000		27,755
Share price (in dollars per share)			$ 10.00