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General - Additional Information (Details) $ / shares in Units, $ in Thousands			3 Months Ended
	May 02, 2018 $ / shares shares	Nov. 06, 2017	Mar. 31, 2018 USD ($) Contract $ / shares	Dec. 31, 2017 USD ($) $ / shares
Class Of Stock [Line Items]
Accumulated deficit | $			$ 317,645	$ 324,832
Reverse stock split		1:350
Reverse stock split ratio		0.0029
Common stock, par value (in dollars per share)			$ 0.01	$ 0.01
Number of distribution contracts with Turkish distributor | Contract			1
Subsequent Event [Member]
Class Of Stock [Line Items]
Reverse stock split	1:500
Reverse stock split ratio	0.002
OTCQB [Member] | Subsequent Event [Member]
Class Of Stock [Line Items]
Reverse stock split	1:500
Reverse stock split ratio	0.002
Number of fractional shares were issued in connected with the reverse stock split | shares	0
Common stock, par value (in dollars per share)	$ 0.01

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Number of distribution contracts.

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Face amount or stated value per share of common stock.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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Reduction in the number of shares during the period as a result of a reverse stock split.

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Description of the stock split arrangement. Also provide the retroactive effect given by a stock split that occurs after the balance date but before the release of financial statements.

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Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one.

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