Stockholders' Equity and Redeemable Convertible Preferred Stock (Details 4) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Total compensation expense	$ 54	$ 89	$ 353	$ 223
Restricted Stock [Member] | Employee [Member]
Total compensation expense				11
Restricted Stock [Member] | Non-Employee [Member]
Total compensation expense		25	255	58
Restricted Stock Units [Member] | Employee [Member]
Total compensation expense	49		72
Stock Option [Member] | Employee [Member]
Total compensation expense	$ 5	$ 64	$ 26	$ 154