Business and Organization (Details) $ / shares in Units, $ in Thousands	Mar. 01, 2017	Oct. 05, 2016 $ / shares	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Subsequent Event [Line Items]
Cash and cash equivalents			$ 17,515	$ 29,268	$ 37,495
Working capital			$ 15,000
NASDAQ listing rules, minimum closing bid price | $ / shares		$ 1.00
NASDAQ listing rules, number of required consecutive business days at minimum bid price to regain compliance		10 days
Subsequent Event | Minimum
Subsequent Event [Line Items]
Reverse stock split	0.3333
Subsequent Event | Maximum
Subsequent Event [Line Items]
Reverse stock split	0.1000