Business and Organization (Details) - USD ($) $ / shares in Units, $ in Thousands		6 Months Ended
	Mar. 10, 2017	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Cash and cash equivalents		$ 15,912	$ 17,515	$ 8,161	$ 29,268
Working capital		$ 12,900
Reverse stock split	33.33%
Common stock, par value (in dollars per share)		$ 0.001	$ 0.001
Minimum bid price requirement (in dollars per share)		$ 1.00