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Shareholders' Equity (Shareholders' Equity) (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands								12 Months Ended
	Dec. 16, 2020	Dec. 16, 2020	Dec. 15, 2020	Dec. 15, 2020	Dec. 14, 2020	Dec. 07, 2020	Jun. 05, 2020	Dec. 31, 2020	Dec. 31, 2019
Stockholders' Equity Note [Abstract]
Preferred stock, shares authorized								50,000,000	50,000,000
Preferred stock, par value								$ 0.001	$ 0.001
Preferred stock, shares issued								0	0
Common stock, shares authorized								250,000,000	250,000,000
Common stock, par value							$ 0.001	$ 0.001	$ 0.001
Subsidiary, Sale of Stock [Line Items]
Common stock, par value							$ 0.001	$ 0.001	$ 0.001
Common stock, shares reserved for future issuance								19,683,333
2006 Plan, number of shares available for grant								1,566,811
Equity Offering, Excluding Underwriter's Option
Subsidiary, Sale of Stock [Line Items]
Stock issued in transaction (shares)					4,900,000
Underwriter's Option
Subsidiary, Sale of Stock [Line Items]
Stock issued in transaction (shares)	735,000
Sale of stock, agreement term	30 days
Equity Offering
Subsidiary, Sale of Stock [Line Items]
Stock issued in transaction (shares)		5,635,000
Sale of stock, price per share (USD per share)	$ 2.45	$ 2.45
Net proceeds from transaction		$ 12,743
Private Placement
Subsidiary, Sale of Stock [Line Items]
Stock issued in transaction (shares)			2,475,712			724,288
Sale of stock, price per share (USD per share)			$ 2.071	$ 2.071		$ 2.071
Net proceeds from transaction				$ 6,210
At the Market Offering
Subsidiary, Sale of Stock [Line Items]
Stock issued in transaction (shares)								1,747,466
Net proceeds from transaction								$ 4,429
Maximum aggregate offering price							$ 25,000
Commissions and fees							3.00%

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