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Effects of Adopting ASC Topic 606, Statements of Operations (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) [Abstract]
Revenue	$ 6	$ 375
Operating expense:
Research and development	1,005	814
Selling, general and administrative	6,609	3,467
Total operating expense	7,614	4,281
Loss from operations	(7,608)	(3,906)
Interest income, net	8	17
Loss before taxes	(7,600)	(3,889)
Provision for income taxes	(5)	(5)
Net loss	$ (7,605)	$ (3,894)
Basic and diluted loss per share (in dollars per share)	$ (0.13)	$ (0.07)
Weighted average shares outstanding basic and diluted (in shares)	60,150	58,145
Pre-606 [Member]
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) [Abstract]
Revenue	$ 381
Operating expense:
Research and development	1,005
Selling, general and administrative	6,609
Total operating expense	7,614
Loss from operations	(7,233)
Interest income, net	8
Loss before taxes	(7,225)
Provision for income taxes	(5)
Net loss	$ (7,230)
Basic and diluted loss per share (in dollars per share)	$ (0.12)
Weighted average shares outstanding basic and diluted (in shares)	60,150
Effects of ASC Topic 606 [Member] | ASC Topic 606 [Member]
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) [Abstract]
Revenue	$ (375)
Operating expense:
Research and development	0
Selling, general and administrative	0
Total operating expense	0
Loss from operations	(375)
Interest income, net	0
Loss before taxes	(375)
Provision for income taxes	0
Net loss	$ (375)
Basic and diluted loss per share (in dollars per share)	$ 0
Weighted average shares outstanding basic and diluted (in shares)	0

X

- Definition

The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc.

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Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS).

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