Nature of Operations and Recent Developments (Additional Details) (Details) $ / shares in Units, $ in Thousands				3 Months Ended	12 Months Ended
	Jan. 03, 2017 USD ($)	Apr. 26, 2016 USD ($) $ / shares shares	Jul. 14, 2014	Dec. 31, 2016 USD ($) shares	Dec. 31, 2016 USD ($) shares	Dec. 31, 2015 USD ($) shares	Dec. 31, 2014 USD ($)	Aug. 29, 2014 $ / shares shares
Class of Stock [Line Items]
Impairment of assets to be disposed of, non-cash charge				$ 3,800
Public offering, net of offering costs (in shares) | shares		13,225,000
Share price (in dollars per share) | $ / shares		$ 3.50
Initial public offering proceeds, net of offering costs of $10,042		$ 42,900			$ 0	$ 0	$ 116,458
Common stock, shares issued | shares				37,831,723	37,831,723	24,539,937
Stock split of common stock			1.57
IPO
Class of Stock [Line Items]
Share price (in dollars per share) | $ / shares								$ 11.00
Initial public offering proceeds, net of offering costs of $10,042							116,500
Common stock, shares issued | shares								11,500,000
Underwriting discounts and commissions expense							7,600
Other offering expense							$ 2,400
Over-Allotment Option
Class of Stock [Line Items]
Common stock, shares issued | shares								1,500,000
Subsequent Event | President | Retirement Agreement
Class of Stock [Line Items]
Cash retirement payment	$ 1,500