Equity Method Investment - Stock purchase agreement with Kleo (Details) $ / shares in Units, $ in Thousands					1 Months Ended		3 Months Ended		9 Months Ended
	Oct. 05, 2017 USD ($) agreement $ / shares shares	Oct. 05, 2017 USD ($) agreement $ / shares shares	Mar. 30, 2017 USD ($) $ / shares shares	Aug. 29, 2016 director tranche $ / shares shares	Jun. 30, 2017 USD ($) shares	Mar. 31, 2017 USD ($) shares	Sep. 30, 2017 USD ($) shares	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) tranche shares	Sep. 30, 2016 USD ($)	Oct. 31, 2017 shares	Dec. 31, 2016
Equity Method Investment
Cash payment for purchase of equity method investment									$ 2,999	$ 3,000
Common stock value for purchase of kleo office stock holder stock									352
Proportionate share of net loss in Kleo							$ 638	$ 75	1,204	$ 75
Common Shares
Equity Method Investment
Common stock value for purchase of kleo office stock holder stock									$ 352
Kleo
Equity Method Investment
Shares of Kleo common stock purchased | shares				3,000,000
Additional shares of Kleo common stock purchased | shares				5,500,000			3,250,000		3,250,000
Price per share | $ / shares				$ 1.00
Number of equal tranches of shares to be purchased | tranche				4
Shares purchased in equal tranches | shares				1,375,000	1,375,000	1,375,000
Period of time shares begin to be purchased in equal tranches after the initial closing				6 months
Period of time shares are purchased after the initial purchase				3 months
Number of equal tranches of shares purchased | tranche									3
Cash payment for purchase of equity method investment					$ 1,375	$ 1,375			$ 3,351
Shares of Kleo common stock purchased from Chief Executive Officer | shares				500,000
Cash payment for purchase of Kleo officer and stockholder shares			$ 250
Issuance of common shares for purchase of Kleo office and stockholder shares (in shares) | shares			32,500
Fair value of share price | $ / shares			$ 10.82
Common stock value for purchase of kleo office stock holder stock			$ 352
Ownership percentage							33.00%		33.00%			18.60%
Number to designate to Kleo's board of directors | director				2
Total number of directors on Kleo's board of directors | director				5
Proportionate share of net loss in Kleo							$ 638		$ 1,204
Kleo | Subsequent Event
Equity Method Investment
Number of agreements | agreement	2	2
Shares of Kleo common stock purchased | shares											3,424,543
Shares purchased in equal tranches | shares	1,375,000	1,375,000
Cash payment for purchase of equity method investment		$ 1,375
Ownership percentage	43.30%	43.30%									43.30%
Kleo | First Subscription Agreement | Subsequent Event
Equity Method Investment
Shares of Kleo common stock purchased | shares	1,397,904	1,397,904
Price per share | $ / shares	$ 1.0993	$ 1.0993
Cash payment for purchase of equity method investment	$ 1,537	$ 1,537
Kleo | Second Subscription Agreement | Subsequent Event
Equity Method Investment
Shares of Kleo common stock purchased | shares	651,639	651,639
Price per share | $ / shares	$ 1.0993	$ 1.0993
Cash payment for purchase of equity method investment	$ 716	$ 716