The Company and Basis of Presentation (Private Placement Offering) (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
	Mar. 15, 2017	Mar. 31, 2018	Mar. 31, 2017
Private Placement Offering
Issuance of stock (in shares)		3,592,858
Gross proceeds		$ 25,150
Exercise price of warrant		$ 10.40
Class of Warrant or Right, Warrant Term		5 years
Private placement
Private Placement Offering
Issuance of stock (in 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
Exercise price of warrant	$ 10.40
Class of Warrant or Right, Warrant Term	5 years