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Stockholders' Equity (Narrative) (Details) $ in Thousands	1 Months Ended	3 Months Ended		12 Months Ended
	Jan. 31, 2020 shares	Mar. 31, 2020 USD ($) item shares	Mar. 31, 2019 USD ($) shares	Dec. 31, 2019 shares
Stockholders' Equity [Line Items]
Number of equity compensation plans | item		3
Stock-based compensation | $		$ 4,032	$ 4,381
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		26,400,000
ESPP [Member]
Stockholders' Equity [Line Items]
Shares issued			1,306,329
Additional common stock reserved for issuance	3,100,000
Common stock reserved for issuance		6,713,447
Stock-based compensation | $		$ 129	$ 548
Employee stock purchase rights offered		0
Stock Options [Member]
Stockholders' Equity [Line Items]
Stock-based compensation | $		$ 1,700	3,200
Options granted				0
Time-Based Restricted Stock Units (RSUs) [Member]
Stockholders' Equity [Line Items]
Stock-based compensation | $		2,200	700
Performance-Based Restricted Stock Units (RSUs) [Member]
Stockholders' Equity [Line Items]
Stock-based compensation | $		$ 0	$ 7

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