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Stockholders' Equity (Narrative) (Details) $ in Thousands	1 Months Ended	3 Months Ended	6 Months Ended		12 Months Ended
	Jan. 31, 2020 shares	Jun. 30, 2020 USD ($) item shares	Jun. 30, 2020 USD ($) item shares	Jun. 30, 2019 USD ($) shares	Dec. 31, 2019 shares
Stockholders' Equity [Line Items]
Number of equity compensation plans | item		3	3
Stock-based compensation | $			$ 7,266	$ 8,470
2010 Plan [Member]
Stockholders' Equity [Line Items]
Additional common stock reserved for issuance	7,700,000
2010 Director Plan [Member]
Stockholders' Equity [Line Items]
Additional common stock reserved for issuance	1,500,000
2010 Plan and 2010 Director Plan [Member]
Stockholders' Equity [Line Items]
Common stock reserved for issuance		27,200,000	27,200,000
ESPP [Member]
Stockholders' Equity [Line Items]
Shares issued			1,306,329	1,306,329
Additional common stock reserved for issuance	3,100,000
Common stock reserved for issuance		6,713,447	6,713,447
Stock-based compensation | $		$ 408	$ 537
Employee stock purchase rights offered			0
Stock Options [Member]
Stockholders' Equity [Line Items]
Stock-based compensation | $		1,100	$ 2,900
Options granted			0		0
Time-Based Restricted Stock Units (RSUs) [Member]
Stockholders' Equity [Line Items]
Stock-based compensation | $		1,600	$ 3,800
Performance-Based Restricted Stock Units (RSUs) [Member]
Stockholders' Equity [Line Items]
Stock-based compensation | $		$ 0	$ 0

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