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Restructuring (Details) - USD ($) $ in Thousands	3 Months Ended									12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Net (loss) income		$ (7,805)	$ (3,177)	$ (3,916)	$ (1,989)	$ 1,284	$ 4,256	$ 2,111	$ 1,129	$ (16,887)	$ 8,780	$ (5,845)
Net (decrease) increase in cash and cash equivalents										(18,011)	27,205	5,545
Cash and cash equivalents		$ 16,629				$ 34,640				$ 16,629	$ 34,640	$ 7,435	$ 1,890
Scenario, forecast | Subsequent event
Subsequent Event [Line Items]
Restructuring charges	$ 1,100

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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