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Consolidated Statements Stockholders' Equity (Deficit) (Unaudited) (Parentheticals) - Common Stock [Member] - shares shares in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Employee stock purchase plan sales, shares (in shares)	110	47
Exercise of stock options, shares (in shares)		160

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Number of shares issued during the period as a result of an employee stock purchase plan.

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Number of share options (or share units) exercised during the current period.

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