Equity Method Investment - Carrying value and Summarized unaudited financial information for Kleo (Details) - USD ($) $ in Thousands	1 Months Ended				3 Months Ended
	Jan. 31, 2018	Oct. 31, 2017	Jun. 30, 2017	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Dec. 31, 2017
Equity Method Investment
Carrying value of investment in Kleo	$ 7,847				$ 7,847		$ 8,494	$ 7,847
Carrying value of equity method investment
Beginning balance	7,847				7,847
Purchase of Kleo common stock					1,375	$ 1,624
Loss recognized in connection with equity method investment					(728)	(218)
Ending balance					8,494
Kleo
Equity Method Investment
Carrying value of investment in Kleo	7,847			$ 4,511	7,847	2,753	8,494	7,847
Carrying value of equity method investment
Beginning balance	7,847				7,847	2,753
Purchase of Kleo common stock	$ 1,375	$ 1,375	$ 1,375	1,375	1,375	1,976
Loss recognized in connection with equity method investment					(728)	(218)
Ending balance				$ 4,511	8,494	4,511
Assets
Current assets							8,025	8,388
Total assets							8,370	8,746
Liabilities
Current liabilities							1,296	1,415
Total liabilities							$ 3,808	$ 4,201
Profit/loss
Loss from Operations					(1,796)	(1,174)
Net loss					$ (1,781)	$ (1,169)